Roland VR-4HD Owner’s Manual

Version 1.5 and later

Before using the VR-4HD, ensure that its system program is at the most recent version. For information on available upgrades for the system program, see the Roland website (http://proav.roland.com).

You can check the system program version by pressing the [SYSTEM SETUP] button g<SYSTEM> g<VERSION>.

Owner’s Manual (this document)

Read this first. It explains the basic things you need to know in order to use the VR-4HD.

PDF Manual (download from the Web)

55 Reference Manual

This manual covers all menu items of the VR-4HD.

It also describes control via MIDI, RS-232, and TALLY/GPIO.

To obtain the PDF manual

1. Enter the following URL in your computer.

http://proav.roland.com

I

2. Go to the VR-4HD product page and click the “Support” tab.

Copyright © 2017 ROLAND CORPORATION

Contents

USING THE UNIT SAFELY. . . . . . . . . . . . . . . . . . . . . . .3

IMPORTANT NOTES.. . . . . . . . . . . . . . . . . . . . . . . . 5

.Panel Descriptions	. . . . . . . . . . . . . . . . . . . . . . .					.	6
Top Panel/Front Panel. . . . . . . .		. . . . . . . . . .	. . . .				6
Rear Panel/Side Panel (Connecting Your Equipment). . . . . . .						.	8
Basic Operations. .	. . . . . . . . . . . . . . . . . . . . . . .					10
Turning the Power On and Off		. . . . . . . . . . .	. . . . . .	.		10
Switching the View Mode of the Built-in Monitor						10
		and Preview Output. . . . . .
Working with Setup Screens (Menus). . . . . . . . . . . . . . .						11
List of Supported Video Formats .		. . . . . . . . . . . . . . . .				. 12
Input Formats . .	. . . . . . . . . . . . . . . . . . . . . . . .					12
Output Formats.	. . . . . . . . . . . . .	. . . . . . . . . . . .	. . . . . .	. . . . . . . . . . . .	. . . . .	. 12
Video Input/Output Settings . . . . . . . . . . . . . . . . .. .						. 13
Setting the Video Input/Output Format. . .			. . . . . .	. . . .		13
Setting the System Format.. . . . . . . . . . . . . . . . .						13
Setting the Input Format for Channel 4. . . . . . . . . . . .						14
Setting the Output Format for Main Output.				. . . . . . . .		. 14
Assigning a Video Source to Channel 4 . .			. . . . . . . . . . . .			15
Adjusting Output Video. . . . . . . . . . . . . . . . . . . . .						. 15
Adjusting the Input Video on Channel 4. .			. . . . . . . . . . .			. 16
Specifying the Video Output from						16
	the PVW OUT Connector/USB 3.0 Port . .				. . .
Inputting Copyright-protected (HDCP) Video. .				. . . . . . . . .		17
Video Operations. . .	. . . . . . . . . . .	. . . . . . . . . .				18
Switching the Video. . . . . . . . . . .		. . . . . . . . . . . .	. . . . .	. . . . . . . . . . . .	. . . . .	. 18
Switching by Tapping the screen. . . . . . . . . . . . . . .						18
Switching the Video Using Buttons. . . . . . . . . . . . . .						18
Switching Automatically (Auto Scan) . . .			. . . .	. . . . . . . . . . . .	. . . . .	. 19
Applying a Fade to the Main Output Video (Output Fade). .					. . .	19
Freezing Input Video (Freeze) .		. . . . . . . . . . . . . . . . .				. 20
Capturing a Still Image from Input Video . .			. . . . . . . . . . .			20
Video Effect Operations. . . . . . . . .		. . . . . . . . . . . .				21
Using Filter Effects. . . . . . . . . . . . . . . . . . . . . . . .						21
Using Compositing Effects. .		. . . . . . . . . . . . . . . . . .				22
Compositing Using Picture-in-Picture (PinP). . . . . . . . .						. 22
Compositing Using Split (SPLIT).. . . . . . . . . . . . . . .						23
Compositing Four Video Streams on a Single Screen (QUAD).						. 24
Compositing Using Key. . . . . . . . . . . . . . . . . . .						. 24

. .Audio Operations	. . . . . . . . . . . . . . . . . . . . . .						. 26
Adjusting the Volume Level of Input Audio . . . . . . . . . .. .							26
Adjusting Input Gain . .			. . . . . . . . . . . . . . . . . .				. 26
Adjusting the Sound Position (Pan). . . . . . . . . . .					. .		27
Adjusting the Volume Balance . .				. . . . . . . . . . . . . .			27
Adjusting the Volume Level of Main Output Audio . . . . . .. .							. 27
Adjusting the Volume Level of USB Output Audio . . . . . . .. .							27
Applying Effects to Audio . . . . . . . . . . . . . . . . . .. .							. 28
Applying Effects to Input Audio . . . . . . . . . . . . .. .							. 28
Applying Effects to Main Output Audio . . . . . . .					. . . .		29
Hearing Only Specific Input Audio (Solo/Mute) . .					. . . . . . . .		30
Eliminating Echo in Web Conferencing Systems (Echo Cancel) .. .							31
Controlling Fader Operation Automatically (Auto Mixing) . . .. .							32
Using the AUX Bus . . . . . . . . . . . . . . . . . . . . . .. .							33
Interlinking Audio Output to Video Switching (Audio Follow).						. .	34
Aligning the Output Timing of Video and Audio (Lip-sync) . .						. .	. 35
Operations Using a Computer . . . . . . . . . . . . . . . . . .							36
Outputting Streaming-use Video/Audio to a Computer . . . . . .							36
Using the Loopback Feature . . . . . . . . . . . . . . . . .							36
Recording Video on a Computer . . . . . . . . . . . . . . .							36
Other Features. . . . . . . . . . . . . . . . . . . . . . . . . .							37
Assigning Functions to USER Buttons.. . . . . . . . . . . . . .							37
Saving/Recalling Settings (Memory) . . . . . . . . . . . . .. .							. 38
Saving a Memory . . . . . . . . . . . . . . . . . . . .. .							. 38
Recalling a Memory .		.	. . . . . . . . . . . . . . . . . . .				39
Preventing Unintended Operation (Panel Lock) . . . . . . . .. .							39
Turning Off the Power Automatically (Auto Off) . . .					. . . . . .		40
Returning Settings to the Factory-default State (Factory Reset). .							. 40
Operating the VR-4HD by Remote Control . . . . . . . . . .. .							. 41
Outputting a Tally Signal or Control Signal . . . . . . . . . .. .							. 41
Calibrating the Tap Points on the Touch Panel. . . . .					. . . . .		42
Appendices. . . . . . . . . . . . . . . . . . . . . . . . . . .							. 43
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . ..							43
Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . .							44
Main Specifications . . . . . . . . . . . . . . . . . . . . .. .							. 46
Dimensions. . . . . .	. . . . . . .	. . .	. . . . . . . . . .	.			47
Transition Effects List . .		. . . . . . . . . . . . . . . . . . . .					. 48

Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Before using this unit, carefully read “USING THE UNIT SAFELY” (p. 3) and “IMPORTANT NOTES” (p. 5). After reading, keep the document(s) including those sections where it will be available for immediate reference.

Checking the Included Items

The VR-4HD includes the following items. Please take a moment to confirm that all of these items have been included with the VR-4HD. If you find that any item is missing, contact the nearest authorized Roland distributor in your country.

The Unit

AC Adaptor/Power Cord

Owner’s Manual

*The shape of the power cord’s plug varies depending on the country.

Conventions in this manual

In order to explain the operations as clearly as possible, this manual uses the following conventions.

55 Text enclosed in square brackets [ ] indicates the name of a button or a knob, such as the [SETUP] button, [VALUE] knob. 55 Text enclosed in angle brackets < > indicates text that appears in the screen, such as <SYSTEM>.

2

USING THE UNIT SAFELY

AboutWARNING and CAUTION Notices

Used for instructions intended to alert the user to the risk of death or severe injury should the unit be used improperly.

Used for instructions intended to alert the user to the risk of injury or material damage should the unit be used improperly.

* Material damage refers to damage or other adverse e ects caused with respect to the home and all its furnishings, as well to domestic animals or pets.

About the Symbols

The symbol alerts the user to important instructions or warnings.The speci c meaning of the symbol is determined by the design contained within the triangle. In the case of the symbol at left, it is used for general cautions, warnings, or alerts to danger.

The symbol alerts the user to items that must never be carried out (are forbidden). The speci c thing that must not be done is indicated by the design contained within the circle. In the case of the symbol at left, it means that the unit must never be disassembled.

The symbol alerts the user to things that must be carried out. The speci c thing that must be done is indicated by the design contained within the circle. In the case of the symbol at left, it means that the power-cord plug must be unplugged from the outlet.

ALWAYS OBSERVE THE FOLLOWING

WARNING

To completely turn off power to the unit, pull out the plug from the outlet

Even with the power switch turned off, this unit is not completely separated from its main source of power. When the power needs to be completely turned off, turn off the power switch on the unit, then

pull out the plug from the outlet. For this reason, the outlet into which you choose to connect the power cord’s plug should be one that is within easy reach and readily accessible.

Concerning the Auto Off function

On this unit, the power is automatically turned off after a predetermined amount of time has passed since an operation was performed (Auto Off function). If you do

not want the power to be turned off automatically, disengage the Auto Off function (p. 40).

Do not disassemble or modify by yourself

Do not carry out anything unless you are instructed to do so in the owner’s manual. Otherwise, you risk causing malfunction.

Do not repair or replace parts by yourself

Refer all servicing to your retailer, the nearest Roland Service Center, or an authorized Roland distributor, as listed on the “Information.”

WARNING

Use only the supplied AC adaptor and the correct voltage

Be sure to use only the AC adaptor supplied with the unit. Also, make sure the line voltage at the installation matches the input voltage specified on

the AC adaptor’s body. Other AC adaptors

may use a different polarity, or be designed for a different voltage, so their use could result in damage, malfunction, or electric shock.

Use only the supplied power cord

Use only the attached power cord. Also, the supplied power cord must not be used with any other device.

Do not bend the power cord or place heavy objects on it

Otherwise, fire or electric shock may result.

Avoid extended use at high volume

Use of the unit at high volume for extended periods of time may cause hearing loss. If you ever experience any hearing loss or ringing in the ears, you should immediately stop using the unit and consult a specialized physician.

WARNING

Turn off the unit if an abnormality or malfunction occurs

Immediately turn the unit off, remove the AC adaptor from the outlet, and request servicing by your retailer, the nearest Roland Service Center, or an authorized Roland distributor, as listed on the “Information” when:

•The AC adaptor or the power cord has been damaged; or

•If smoke or unusual odor occurs; or

•Objects have fallen into, or liquid has been spilled onto the unit; or

•The unit has been exposed to rain (or otherwise has become wet); or

•The unit does not appear to operate normally or exhibits a marked change in performance.

Be cautious to protect children from injury

Always make sure that an adult is on hand to provide supervision and guidance when using the unit in places where children are present, or when a child will be using the unit.

Do not drop or subject to strong impact

Otherwise, you risk causing damage or malfunction.

Do not use or store in the following types of locations

• Subject to temperature extremes (e.g.,

direct sunlight in an enclosed vehicle, near a heating duct, on top of heatgenerating equipment); or are

• Damp (e.g., baths, washrooms, on wet

floors); or are

• Exposed to steam or smoke; or are

•Subject to salt exposure; or are

•Exposed to rain; or are

•Dusty or sandy; or are

•Subject to high levels of vibration and shakiness; or are

•Placed in a poorly ventilated location.

Do not allow foreign objects or liquids to enter unit; never place containers with liquid on unit

Do not place containers containing liquid (e.g., flower vases) on this product. Never allow foreign objects (e.g., flammable objects, coins, wires) or liquids (e.g., water or juice) to enter this product. Doing so may cause short circuits, faulty operation, or other malfunctions.

Do not share an outlet with an unreasonable number of other devices

Otherwise, you risk overheating or fire.

Do not use overseas

Before using the unit in overseas, consult with your retailer, the nearest Roland Service Center, or an authorized Roland distributor, as listed on the “Information.”

Do not place in an unstable location

Otherwise, you risk injury as the result of the unit toppling over or dropping down.

3

USING THE UNIT SAFELY

CAUTION

When disconnecting the power cord, grasp it by the plug

To prevent conductor damage, always grasp the power cord by its plug when disconnecting it.

Periodically clean the power plug

An accumulation of dust or foreign objects between the power plug and the power outlet can lead to fire or electric shock.

At regular intervals, be sure to pull out the power plug, and using a dry cloth,

wipe away any dust or foreign objects that may have accumulated.

Disconnect the power plug whenever the unit will not be used for an extended period of time

Fire may result in the unlikely event that a breakdown occurs.

Route all power cords and cables in such a way as to prevent them from getting entangled

Injury could result if someone were to trip on a cable and cause the unit to fall or topple.

Avoid climbing on top of the unit, or placing heavy objects on it

Otherwise, you risk injury as the result of the unit toppling over or dropping down.

Never connect/disconnect a power plug if your hands are wet

Otherwise, you could receive an electric shock.

Disconnect all cords/cables before moving the unit

Before moving the unit, disconnect the power plug from the outlet, and pull out all cords from external devices.

Before cleaning the unit, disconnect the power plug from the outlet

If the power plug is not removed from the outlet, you risk receiving an electric shock.

Whenever there is a threat of lightning, disconnect the power plug from the outlet

If the power plug is not removed from the outlet, you risk causing malfunction or receiving an electric shock.

Handle the ground terminal carefully

If you remove the screw from the ground terminal, be sure to replace it; don’t leave it lying around where it could accidentally be swallowed by small children. When refastening the screw, make that it is firmly fastened, so it won’t come loose.

Precautions concerning use of phantom power supply

Always turn the phantom power off when connecting any device other than condenser microphones that require phantom power. You risk causing damage if you mistakenly supply phantom power

to dynamic microphones, audio playback devices, or other devices that don’t require such power. Be sure to check the specifications of any microphone you intend to use by referring to the manual that came with it.

(This instrument’s phantom power: 48 V DC, 10 mA Max)

4

IMPORTANT NOTES

Power Supply

•Do not connect this unit to same electrical outlet that is being used by an electrical appliance that is controlled by an inverter or a motor (such as a refrigerator, washing machine, microwave oven, or air conditioner). Depending on the way in which

the electrical appliance is used, power supply noise may cause this unit to malfunction or may produce audible noise. If it is not practical to use a separate electrical outlet, connect a power supply noise filter between this unit and the electrical outlet.

•The AC adaptor will begin to generate heat after long hours of consecutive use. This is normal, and is not a cause for concern.

Placement

•Using the unit near power amplifiers (or other equipment containing large power transformers) may induce hum. To alleviate the problem, change the orientation of this unit; or move it farther away from the source of interference.

•This unit may interfere with radio and television reception. Do not use this unit in the vicinity of such receivers.

•Noise may be produced if wireless communications devices, such as cell phones, are operated in the vicinity of this unit. Such noise could occur when receiving or initiating a call, or while conversing. Should you experience such problems, you should relocate such wireless devices so they are at a greater distance from this unit, or switch them off.

•When moved from one location to another where the temperature and/or humidity is very different, water droplets (condensation) may form inside the unit. Damage or malfunction may result if you attempt to use the unit in this condition. Therefore, before using the unit, you must allow it to stand for several hours, until the condensation has completely evaporated.

•Depending on the material and temperature of the surface on which you place the unit, its rubber feet may discolor or mar the surface.

•Do not place containers or anything else containing liquid on top of this unit. Also, whenever any liquid has been spilled on the surface of this unit, be sure to promptly wipe it away using a soft, dry cloth.

Maintenance

•Never use benzine, thinners, alcohol or solvents of any kind, to avoid the possibility of discoloration and/or deformation.

Repairs and Data

•Before sending the unit away for repairs, back up the data stored in the unit by writing down the stored information or by using VR-4HD RCS dedicated software (p. 41). Although we will do our utmost

to preserve the data stored in your unit when we carry out repairs, in some cases, such as when the memory section is physically damaged, restoration of the stored content may be impossible. Roland assumes no liability concerning the restoration of any stored content that has been lost.

Grounding Terminal

•Depending on the circumstances of a particular setup, you may experience a discomforting sensation, or perceive that the surface feels gritty to the touch when you touch this device, microphones connected to it, or the metal portions of other objects. This is due to an infinitesimal electrical charge, which is absolutely harmless. However, if you are concerned about this, connect the ground terminal (see figure on page 8) with an external ground. When the unit is grounded, a slight hum may occur, depending on the particulars of your installation. If you are unsure of the connection method, contact the nearest Roland Service Center, or an authorized Roland distributor, as listed on the “Information.”

Unsuitable places for connection

•Water pipes (may result in shock or electrocution)

•Gas pipes (may result in fire or explosion)

•Telephone-line ground or lightning rod (may be dangerous in the event of lightning)

Additional Precautions

•Any data stored within the unit can be lost as the result of equipment failure, incorrect operation, etc. To protect yourself against the irretrievable loss of important data stored in the unit, use VR-4HD RCS dedicated software (p. 41) to make backups.

•Roland assumes no liability concerning the restoration of any stored content that has been lost.

•Use a reasonable amount of care when using the unit’s buttons, sliders, or other controls; and when using its jacks and connectors. Rough handling can lead to malfunctions.

•Never strike or apply strong pressure to the display.

•When disconnecting all cables, grasp the connector itself—never pull on the cable. This way you will avoid causing shorts, or damage to the cable’s internal elements.

•To avoid disturbing others nearby, try to keep the unit’s volume at reasonable levels.

•This unit allows you to switch images at high speed. For some people, viewing such images can cause headache, nausea, or other discomfort. Do not use this unit to create video that might cause these types of health problems. Roland Corporation

will accept no responsibility for any such health problems that may occur in yourself or in viewers.

•Do not use connection cables that contain a built-in resistor.

Intellectual Property Right

•It is forbidden by law to make an audio recording, video recording, copy or revision of a third party’s copyrighted work (musical work, video work, broadcast, live performance, or other work), whether in whole or in part, and distribute,

sell, lease, perform or broadcast it without the permission of the copyright owner.

•Do not use this product for purposes that could infringe on a copyright held by a third party. We assume no responsibility whatsoever with regard to any infringements of third-party copyrights arising through your use of this product.

•This product can be used to record or duplicate audio or visual material without being limited by certain technological copy-protection measures. This is due to the fact that this product is intended to be used for the purpose of producing original music or video material, and is therefore designed so that material that does not infringe copyrights belonging to others (for example, your own original works) can be recorded or duplicated freely.

•This product contains eParts integrated software platform of eSOL Co.,Ltd. eParts is a trademark of eSOL Co., Ltd. in Japan.

•Roland is an either registered trademark or trademark of Roland Corporation in the United States and/or other countries.

•Company names and product names appearing in this document are registered trademarks or trademarks of their respective owners.

5

Panel Descriptions

Top Panel/Front Panel

5	6
11
7
1
2

3

11

8

9

10

12 13 14 15 16

19

17 18

4

20

21

Front Panel

11

Audio Section

This section is for mixing audio and adjusting the input sensitivity of the audio channels.

	No.	Name	Explanation	Page
	1	HDMI [1]–[4] knobs	This adjusts the volume level of HDMI audio (embedded audio).	p. 27
		HDMI [SETUP] button	This displays the setup screen for HDMI audio on the built-in monitor.	p. 11
		SIG/PEAK indicators	These display the input level of the audio channels.	p. 26
	2
		[GAIN] knobs	These adjust the gain (input sensitivity) of the audio channels.
		[SETUP] button	These display the setup screens for the audio channels on the built-in monitor.	p. 11
	3	Channel faders	These adjust the volume levels of the audio channels.	p. 27
		Level meter	This displays the volume level of the main output audio.	p. 29
	4	[REVERB] knob	This adjusts the return level from reverb of the audio.	p. 27
		[MAIN] fader	This adjusts the volume level of the main output audio.	p. 29
		MAIN [SETUP] button	This displays the setup screen for main audio output on the built-in monitor.	p. 11
		USB [SETUP] button	This displays the setup screen for USB audio (input/output) on the built-in monitor.	p. 11
	5	SIG/PEAK indicator	This displays the input/output level of USB audio.	p. 27
		[FROM PC] knob	This adjusts the volume level of audio input via USB.	p. 27
		[TO PC] knob	This adjusts the volume level of audio output via USB.	p. 27
	6	[PHONES] knob	This adjusts the volume of headphones connected to the PHONES jack.	—

6

Panel Descriptions

Common Section

No.	Name			Explanation	Page
	USER [1]–[5] buttons		You use these to switch assigned functions on and off, and to display screens for accessing functions.
7			* By factory default, the functions shown on the operation panel are assigned to the USER buttons.
					p. 37
	USER [SETUP] button		This displays the setup screen for USER buttons on the built-in monitor.
			55 This displays the incoming video from the sources, output video, a volume level meter, and setup screens. To		p. 10
8			change the monitor’s view mode, use 13 the [INPUT] or [OUTPUT] buttons.
	Monitor (touch screen)				p. 11
			55 You can change the picture and select menu items by tapping the screen.
			* Don’t touch the screen in two or more locations simultaneously; the locations will not be detected correctly.		p. 18
9	[SYSTEM SETUP] button		This displays the setup screen for items related to video, audio, and the unit on the built-in monitor.
					p. 11
10	[VALUE] knob		Use this knob to move the cursor to setup screens and other areas, and to change setting values. Pressing the
			[VALUE] knob accepts the setting item that has been selected or applies the change made to a setting value.
			These release internal heat to inhibit temperature rises inside the VR-4HD. Heat-radiating ports are also found on the
11			bottom panel.
	Heat-radiating ports				—
			NOTE
			55 Never	obstruct the heat-radiating ports. Obstructing the heat-radiating ports can result in temperature rises
			inside the VR-4HD, leading to risk of malfunction due to heat.

Video Section

This section is for making picture transitions, compositing video, and making effect settings.

No.	Name					Explanation		Page
12	[IN/OUT SETUP] button		This displays the input/output setup screen for video on the built-in monitor. Use this to specify the VIDEO IN					p. 15
			connector to assign to video channel 4. Also use it to specify the video to output via the PVW OUT connector and the
								p. 16
			USB 3.0 port.
			These switch the view mode of the built-in monitor and preview output (the PVW OUT connector).
	[INPUT] button							p. 10
13			[INPUT] button			This displays the input video from the respective source devices as a four-way split screen.
	[OUTPUT] button					You can change the video by tapping the channel screen on the built-in monitor.		p. 18
			[OUTPUT] button			This displays the results of video mixing (main output video).
14	[VIDEO FX/KEY LEVEL] button		This displays on the built-in monitor the screen for adjusting the amount of filter effects applied and the degree of					p. 21
								p. 24
			extraction for key composition.
15	HDCP indicator		This lights up, flashes, or goes dark according to the VR-4HD’s “HDCP” setting and the connected status of HDCP-					p. 17
			compatible equipment.
16	[FREEZE] button		This stops (freezes) input video. The [FREEZE] button lights up during a freeze.					p. 20
			These select video composition effects. The selected button lights up during use.
	[PinP] button							p. 22
17			[PinP] button			This composites video in an inset screen over a background video.
	[SPLIT] button							p. 23
			[SPLIT] button			This composites two video streams in a split screen.
	[QUAD] button							p. 24
			[QUAD] button			This composites the input pictures on video channels 1 through 4 in a single screen.
			These select video transition effects. The selected button lights up.
	[CUT] button
			[CUT] button			The picture switches instantly.
	[MIX] button							p. 18
18			[MIX] button			The two pictures are blended together as the video is switched.
	[WIPE] button
			[WIPE] button			In this transition, the original video is broken into by the next video.
	[TIME] knob		This sets the video transition time (in seconds).					p. 18
			55 This performs a fade-in or fade-out for the main output video. The [OUTPUT FADE] button indicates the status of
			the fade.
19	[OUTPUT FADE] button		Lighted: Fade-out					p. 19
			Flashing: Fade-in/fade-out in progress					p. 20
			Dark:	Normal output
			55 This outputs a captured still image or a still image sent from the dedicated VR-4HD RCS program.
20	[KEY] button		This switches key composition on or off. When on, the [KEY] button lights up.					p. 24
21	VIDEO INPUT SELECT		Use these buttons to switch the video. The selected button lights up indicating selected live channel.					p. 18
	[1]–[4] buttons

7

Panel Descriptions

Rear Panel/Side Panel (Connecting Your Equipment)

*To prevent malfunction and equipment failure, always turn down the volume, and turn off all the units before making any connections.

*Be sure to use cables and adaptor plugs with the proper connectors matching those of the other devices you are using.

RS-232 connector

Here you connect a device used to operate the VR-4HD by remote control (such as an RS-232-compatible computer).

HDMI IN 1–4 connectors, RGB/COMPONENT 4 Input connector, COMPOSITE 4 Input connector

These are for inputting video signals from a computer or video devices such as video cameras and DVD players. * You switch the video source on video channel 4 by changing the assigned input connector (p. 15).

RS-232 connector	Analog RGB	Component output	Composit output	HDMI output
	output connector	connector	connector	connector

* Analog RGB and DVI-D is fixed at full-range and cannot be changed.

TALLY/GPIO connector

Here you connect devices provided with a tally-light feature or with control-signal input/output functionality.

Grounding terminal

You connect this to an external ground.

For details, refer to “Grounding Terminal” in “IMPORTANT NOTES” (p. 5).

[POWER] button

This turns the power on and off (p. 10).

Making the connection using an extension cable or USB hub might result in the computer failing to recognize the VR-4HD. We recommend using a direct connection between the VR-4HD and the computer.

USB 3.0 port

* When outputting video via USB, make the connection to the USB 3.0 port.

USB port

Here you connect a computer.

55 Use this to input audio played back on the computer and to output the results of video and audio mixing. You can use this for operations such as sending video and audio over the Internet (p. 36).

55 Use VR-4HD RCS dedicated software to operate the VR-4HD remotely (p. 41).

RGB/COMPONENT output connector

HDMI OUT connector

Analog RGB

Component input

HDMI input

input connector

connector

connector

This outputs the video mixing result (main output video). Here you connect devices such as projectors, recording equipment, and external displays.

PVW OUT connector

HDMI input connector

This outputs either the input video as a four-way split screen or the main output video (p. 10, 16). You connect a preview-use monitor here.

8

Panel Descriptions

AUDIO IN 5/6 jacks, 7/8 jack

AUDIO OUT connectors/jacks, AUX OUT jacks

Here you input audio signals from video decks, CD players, and other such audio equipment.

These output the results of the audio mix. Here you connect an audio recording deck, amplifier, speakers, or other such equipment.

Audio input connectors

			* The VR-4HD has two internal audio buses, and you	Audio input connectors
			can select the audio bus to output for each individual
			connector (p. 33).

	TIP:	HOT
Miniature stereo	RCA phonoRING:	COLD 2: HOT
phone plug	plug
	SLEEVE: GND		3: COLD

* Pin assignment of AUDIO OUT connectors (XLR)

1: GND 1: GND

2: HOT

3: COLD
RCA phono		RCA phono
plug	XLR plug	plug

* Pin assignment of AUDIO INPUT 1–4 jacks (XLR/TRS)

TIP:	HOT	1: GND
RING:	COLD 2: HOT

SLEEVE: GND	3: COLD

DC IN jack

This is for connecting the included AC adaptor.

AC adaptor

Power cord

To AC Outlet

AUDIO INPUT 1–4 jacks (XLR/TRS)

1: GND 2: HOT

These are for inputting audio signals from

microphones, audio mixers, and other such audio equipment3: COLD.

Audio input connectors

PHONES jack

This is for connecting headphones.

Place the AC adaptor so the side with the indicator faces upwards and the side with printed information faces downwards. The indicator will light when you plug the AC adaptor into an AC outlet.

* To prevent the inadvertent disruption of power to your unit (should the plug be pulled out accidentally), and to avoid applying undue stress to the jack, anchor the power cord using the cord hook, as shown in the illustration.

	Cord hook
		1/4-inch TRS	1/4-inch TRS	Miniature stereo
[PHANTOM] switches	XLR plug	phone plug	phone plug	phone plug

The VR-4HD supports phantom power. When using a condenser microphone that requires phantom power, set the [PHANTOM] switch to “ON.”

NOTE

55 Always turn the phantom power off when connecting any device other than condenser microphones that require phantom power. You risk causing damage if you mistakenly supply phantom power to dynamic microphones, audio playback devices, or other devices that don’t require such power. Be sure to check the specifications of any microphone you intend to use by referring to the manual that came with it.

(This instrument’s phantom power: 48 V DC, 10 mA Max)

9

Basic Operations

Turning the Power On and Off

Once everything is properly connected (p. 8), be sure to follow the procedure below to turn on their power. If you turn on equipment in the wrong order, you risk causing malfunction or equipment failure.

*Before turning the unit on/off, always be sure to turn the volume down. Even with the volume turned down, you might hear some sound when switching the unit on/off. However, this is normal and does not indicate a malfunction.

Turning the power on

1.Make sure all devices are turned off.

2.Press the [POWER] button on the rear panel of the VR-4HD to turn on the power.

3.Turn on the power to the source devices.

Turn on the power to video cameras or other source equipment connected to input connectors on the VR-4HD.

4.Turn on the power to the output devices.

Turn on the power to projectors or other devices connected to output connectors on the VR-4HD.

Turning the power off

1.Turn off the power in the sequence of first the output equipment, and then the sources.

2.Press the [POWER] button on the VR-4HD to turn off the power.

About the Auto Off function

The power to the VR-4HD turns off automatically when all of the following states persist for 240 minutes (Auto Off function).

55 No operation performed on the VR-4HD 55 No audio or video input

*If you do not want the power to be turned off automatically, disengage the Auto Off function (p. 40).

*When the power has been turned off by the Auto Off function, to restart, first press the [POWER] button to return it, then turn on the power.

NOTE

55 Any settings that you are in the process of editing will be lost when the power is turned off. If you have any settings that you want to keep, you should save them beforehand.

Switching the View Mode of the Builtin Monitor and Preview Output

The VR-4HD’s built-in monitor and preview output (the PVW OUT connector) have two types of view modes: the “input mode” and the “output mode.”

MEMO

55 Switching the view mode makes it change not only for the builtin monitor, but for preview output as well. Using the panel lock feature (p. 39) lets you lock the buttons to prevent accidental operation.

1.Press the [INPUT] or [OUTPUT] button to switch the view mode.

The selected button lights up and the view mode of the built-in monitor and preview output is changed.

[INPUT] button: Input mode

This displays video input from source equipment on a four-way split screen. The input video is arranged as shown below.

Channel 1	Channel 2
Channel 3	Channel 4

*Labels identifying the input signals are displayed only on the built-in monitor. To display or hide the labels, use the [SYSTEM SETUP] button g <SYSTEM> g<INPUT CH LABEL DISPLAY> to make the setting.

[OUTPUT] button: Output mode

This displays the video currently being output.

MEMO

55 You can select either “LOW” (dark) or “HIGH” (bright) as the brightness level of the built-in monitor. Use the [SYSTEM SETUP] button g<SYSTEM> g<LCD BRIGHTNESS> to select.

55 You can hide the level meter displayed at the bottom of the screen. Use the [SYSTEM SETUP] button g<SYSTEM> g<LEVEL METER DISPLAY> to set the value to “OFF.”

10

Basic Operations

Working with Setup Screens (Menus)

Display for the various setup screens on the built-in monitor. In these menus change settings for video, audio and for general VR-4HD settings.

Displaying/Quitting Setup Screens

Selecting a Setting Item

The VR-4HD has a number of different setup screens. There are different buttons for each setup screen that will bring up the parameters for that button onto the display screen.

1.Press one of the buttons shown below to display the respective setup screen.

The selected button lights up.

	Button	Displayed setup screen
	USER [SETUP]	USER button settings
	HDMI [SETUP]	Settings for HDMI input audio
	USB [SETUP]	Settings for USB input/output audio
	Audio channel 1–7/8 [SETUP]	Settings for input audio
	MAIN [SETUP]	Settings for main output audio
	[IN/OUT SETUP]	Assignments to video input/output
		connectors
	[SYSTEM SETUP]	Settings for the system (video, audio, and
		the unit)

2.Press the button you selected in step 1 once or several times to quit the setup screen.

MEMO

55 Settings made at the setup screen are saved in the unit at the time when you quit the screen.

55 You can adjust the contrast of the setup screen. Use the [SYSTEM SETUP] button g<SYSTEM> g<MENU DISPLAY LEVEL> to adjust it.

55 The setup screen is displayed superimposed on the video on the built-in monitor. You can hide the video on the built-in monitor by pressing the lighted [INPUT] or [OUTPUT] button to make the button go dark.

55 For more information about setting items, refer to the Reference Manual (PDF) available for download from the Roland website.

http://proav.roland.com/

Two methods are available for selecting setting items: by operating the touch panel and by operating the [VALUE] knob.

Touch Panel Operation

1. Tap the setting item.

[VALUE] Knob Operation

1.Turn the [VALUE] knob to move the cursor to the setting item, then press the [VALUE] knob.

55 The selected setting item is displayed with a red background.

55 At the setup screen for the system, you first go to the bottom area of the screen and select the category, then select the setting item.

55 The setup screens are composed of two or more pages. You can

change the page by selecting < > or < > at the top of the screen.

Changing Setting Values

1.Turn the [VALUE] knob to change the setting value.

*You can change the setting value in larger steps by holding down the

[VALUE] knob as you turn it.

55 Pressing the [VALUE] knob returns you to the cursor view.

55 You can turn on-screen on/off switches on and off by pressing the [VALUE] knob or by tapping the switch on the screen.

55 When a setup screen is displayed, pressing and holding the [VALUE] knob (for 2 seconds or longer) returns the selected setting item to its default value.

55 For the following setting items, changes are not applied until you press the [VALUE] knob to accept the setting.

Setup screen for the system ([SYSTEM SETUP] Button)

Category	Setting item
VIDEO CH4	RESOLUTION (EDID)
	OUTPUT RESOLUTION
	OUTPUT COLOR SPACE
VIDEO OUT	OUTPUT DVI-D/HDMI
	PREVIEW COLOR SPACE
	PREVIEW DVI-D/HDMI
	HDCP
SYSTEM	FRAME RATE
	SYSTEM FORMAT

11

List of Supported Video Formats

Input Formats

	Input connector	Frame rate
		When set at “59.94 Hz”	When set at “50 Hz”
		720/59.94p	720/50p
	HDMI IN 1–3	1080/59.94i	1080/50i
		1080/59.94p	1080/50p
		480/59.94i	576/50i
		480/59.94p	576/50p
		720/59.94p	720/50p
		1080/59.94i	1080/50i
		1080/59.94p	1080/50p
		640 x 480/60 Hz	640 x 480/60 Hz
	HDMI IN 4	800 x 600/60 Hz	800 x 600/60 Hz
		1024 x 768/60 Hz	1024 x 768/60 Hz
		1280 x 768/60 Hz	1280 x 768/60 Hz
		1280 x 1024/60 Hz	1280 x 1024/60 Hz
		1366 x 768/60 Hz	1366 x 768/60 Hz
		1400 x 1050/60 Hz	1400 x 1050/60 Hz
		1600 x 1200/60 Hz	1600 x 1200/60 Hz
		1920 x 1200/60 Hz	1920 x 1200/60 Hz
		480/59.94i	576/50i
	RGB/COMPONENT 4	480/59.94p	576/50p
		720/59.94p	720/50p
	(component signal)
		1080/59.94i	1080/50i
		1080/59.94p	1080/50p
		640 x 480/60 Hz	640 x 480/60 Hz
		800 x 600/60 Hz	800 x 600/60 Hz
		1024 x 768/60 Hz	1024 x 768/60 Hz
	RGB/COMPONENT 4	1280 x 768/60 Hz	1280 x 768/60 Hz
		1280 x 1024/60 Hz	1280 x 1024/60 Hz
	(RGB signal)
		1366 x 768/60 Hz	1366 x 768/60 Hz
		1400 x 1050/60 Hz	1400 x 1050/60 Hz
		1600 x 1200/60 Hz	1600 x 1200/60 Hz
		1920 x 1200/60 Hz	1920 x 1200/60 Hz
	COMPOSITE 4	480i	576i

* The refresh rates are the maximum value for each resolution.

	Audio input format	HDMI	Linear PCM, 24 bits/48 kHz, 2 ch
		USB	Linear PCM, 16 bits/48 kHz, 2 ch

Output Formats

	Output connector	Frame rate
		When set at “59.94 Hz”	When set at “50 Hz”
		480/59.94i	576/50i
		480/59.94p	576/50p
		720/59.94p	720/50p
		1080/59.94i	1080/50i
		1080/59.94p	1080/50p
		640 x 480/60 Hz	640 x 480/75 Hz
	HDMI OUT	800 x 600/60 Hz	800 x 600/75 Hz
		1024 x 768/60 Hz	1024 x 768/75 Hz
		1280 x 768/60 Hz	1280 x 768/75 Hz
		1280 x 1024/60 Hz	1280 x 1024/75 Hz
		1366 x 768/60 Hz	1366 x 768/75 Hz
		1400 x 1050/60 Hz	1400 x 1050/75 Hz
		1600 x 1200/60 Hz	1600 x 1200/60 Hz
		1920 x 1200/60 Hz	1920 x 1200/60 Hz
	RGB/COMPONENT	480/59.94p	576/50p
		720/59.94p	720/50p
	(component signal) (*1)
		1080/59.94p	1080/50p
		640 x 480/60 Hz	640 x 480/75 Hz
		800 x 600/60 Hz	800 x 600/75 Hz
		1024 x 768/60 Hz	1024 x 768/75 Hz
	RGB/COMPONENT	1280 x 768/60 Hz	1280 x 768/75 Hz
		1280 x 1024/60 Hz	1280 x 1024/75 Hz
	(RGB signal)
		1366 x 768/60 Hz	1366 x 768/75 Hz
		1400 x 1050/60 Hz	1400 x 1050/75 Hz
		1600 x 1200/60 Hz	1600 x 1200/60 Hz
		1920 x 1200/60 Hz	1920 x 1200/60 Hz
		720/59.94p	720/50p
	PVW OUT	1080/59.94i	1080/50i
		1080/59.94p	1080/50p
		720/29.97p	720/25p
	USB 3.0	(uncompressed)	(uncompressed)
		1080/29.97p	1080/25p
		(uncompressed)	(uncompressed)

(*1) No component output is made at 480i/576i or 1080i.

	Audio output format	HDMI	Linear PCM, 24 bits/48 kHz, 2 ch
		USB	Linear PCM, 16 bits/48 kHz, 2 ch

About Input/Output Format Settings

The input/output format is set as shown below.

Input connector	Input formats		Output connector	Output formats
				This is set using the system format.
HDMI IN 1–3	This is set using the system format.		HDMI OUT
HDMI IN 4	This is automatically detected to match the connected			You can also specify a desired output format.
	equipment.			For details, refer to “Setting the Output Format for Main
RGB/COMPONENT 4			RGB/COMPONENT
	You can also specify a desired input format.			Output” (p. 14).
COMPOSITE 4	For details, refer to “Setting the Input Format for Channel 4”		PVW OUT	This is set using the system format.
	(p. 14).		USB 3.0

* For information on how to set the system format, refer to “Setting the System Format” (p. 13).

12

Video Input/Output Settings

Setting the Video Input/Output Format

Set parameters for the input/output format to match the connected equipment.

Setting the System Format

On the VR-4HD, the input/output format is determined according to the system format. You set the input/output format to match the connected equipment.

		Input format (*1)	Output format
	System format setting		PVW OUT connector
		HDMI IN 1–3 connector	HDMI OUT connector (*2)	USB 3.0 port
			RGB/COMPONENT output connector (*2)
	1080p	1080p, 1080i	1080p	1080p
	1080i	1080p, 1080i	1080i
	720p	720p	720p	720p

(*1) For channel-4 input connectors (HDMI IN 4, RGB/COMPONENT 4, and COMPOSITE 4), you can specify an independent input format, regardless of the system format.

For details, refer to “Setting the Input Format for Channel 4” (p. 14).

(*2) For the HDMI OUT connector and the RGB/COMPONENT output connector, you can specify a desired output format. The output-format setting follows the system format only when set to “AUTO.”

For details, refer to “Setting the Output Format for Main Output” (p. 14).

1.

2.

3.

Press the [SYSTEM SETUP] button to display the setup screen. Select <SYSTEM> to display the SYSTEM menu.

Select <SYSTEM FORMAT>.

Internal Processing

The VR-4HD’s internal processing is progressive. Interlaced input video is automatically converted to a progressive signal.

The picture might appear jagged at this time, or the picture in a PinP inset screen or preview four-way split screen might waver. This is due to progressive conversion, and is not a malfunction.

The methods for converting an interlaced signal to a progressive signal are of two types: “BOB” and “WEAVE.”

		This interpolates the top field and bottom field, and unites them
	BOB	in a single frame.
		This is optimal for video that contains much movement.
	WEAVE	This joins the top field and bottom field in a single frame. This is
		optimal for video that contains little movement.

4.Use the [VALUE] knob to set the system format to “1080p,” “1080i,” or “720p.”

5.Press the [VALUE] knob to apply the setting.

*The change is not applied unless you press the [VALUE] knob to accept the setting.

6.Press the [SYSTEM SETUP] button several times to quit the setup screen.

MEMO

55 You can check the formats of video being input and output at the setup screen displayed by pressing the [IN/OUT SETUP] button.

If the icon is displayed, this indicates that video in a format that differs from the setting on the VR-4HD is being input.

To set the conversion method, use the [SYSTEM SETUP] button g <SYSTEM> g<DEINTERLACE MODE> to make the setting.

About Frame Rates

Frame rates which can be input and output are “59.94 Hz” and “50 Hz” (For output via the USB 3.0 port only, the possible frame rates are “29.97 Hz” and “25 Hz”). Inputting video at a frame rate other than these might result in no output or dropped frames.

To change the frame rate, press the [SYSTEM SETUP] button g <SYSTEM> g<FRAME RATE> gselect “59.94 Hz” or “50 Hz,” then press the [VALUE] knob.

13

Video Input/Output Settings

Setting the Input Format for Channel 4

By factory default, the EDID assignment for channel 4 is “AUTO” (set so that EDID values of all inputtable formats are sent).

To specify an input format of your choice, change the setting of the EDID information being sent so that it matches the incoming video signal.

MEMO

55 EDID information is not sent during component signal input.

1.Press the [SYSTEM SETUP] button to display the setup screen.

2.Select <VIDEO CH4> to display the VIDEO CH4 menu.

3.Select <RESOLUTION (EDID)>.

4.Use the [VALUE] knob to set the input format (the EDID information to send).

Value		Video signal that is input (channel 4)
		RGB/COMPONENT connector	HDMI connector
480/576i	480/576p
720p	1080i	Component
1080p
640 x 480	800 x 600		HDMI
1024 x 768	1280 x 768
1280 x 1024	1366 x 768	RGB
1400 x 1050	1600 x 1200
1920 x 1200
AUTO		EDID information for all inputtable formats
		is sent.

5.Press the [VALUE] knob to apply the setting.

*The change is not applied unless you press the [VALUE] knob to accept the setting.

6.Press the [SYSTEM SETUP] button several times to quit the setup screen.

Setting the Output Format for Main Output

By factory default, the format of video output via the HDMI OUT connector and RGB/COMPONENT output connector is set to “AUTO” (the same format as the system format on page 13).

To specify an output format of your choice, change the setting to match the setting on the device receiving the output from the VR-4HD.

MEMO

55 Output video from the HDMI OUT and RGB/COMPONENT output connectors all have the same video format. Selecting individual video formats for these is not possible.

1.Press the [SYSTEM SETUP] button to display the setup screen.

2.Select <VIDEO OUT> to display the VIDEO OUT menu.

3.Select <OUTPUT RESOLUTION>.

4. Use the [VALUE] knob to set the output format.

Value		Video signal that is output
		RGB/COMPONENT connector	HDMI connector
480/576i (*1)	480/576p
720p	1080i (*1)	Component
1080p
640 x 480	800 x 600		HDMI
1024 x 768	1280 x 768
1280 x 1024	1366 x 768	RGB
1400 x 1050	1600 x 1200
1920 x 1200
AUTO		Follows the system format setting (p. 13).

(*1) The “480/576i” and “1080i” formats are supported for HDMI output only.

When the setting is “480/576i” or “1080i,” no video is output from the RGB/ COMPONENT output connector.

5.Press the [VALUE] knob to apply the setting.

*The change is not applied unless you press the [VALUE] knob to accept the setting.

6.Press the [SYSTEM SETUP] button several times to quit the setup screen.

14

Video Input/Output Settings

Assigning a Video Source to Channel 4

By factory default, input on channel 4 is set to “HDMI” (video input via the HDMI IN 4 connector). When you want to input video via a different connector, change this setting.

1. Press the [IN/OUT SETUP] button to display the setup screen.

2. Select <CH4>.

3.Use the [VALUE] knob to specify the video source to input on channel 4.

Value	Explanation
HDMI	Video is input via the HDMI IN 4 connector.
RGB	Video is input via the RGB/COMPONENT 4 connector.
COMPOSITE	Video is input via the COMPOSITE 4 connector.

4. Press the [IN/OUT SETUP] button to quit the setup screen.

MEMO

55 You can also use the [SYSTEM SETUP] button g< VIDEO CH4 > g < INPUT ASSIGN > to specify the video source.

Adjusting Output Video

You adjust the main output video (HDMI OUT connector and RGB/ COMPONENT output connector) or the preview output video (PVW OUT connector) to match the equipment receiving output from the VR-4HD.

MEMO

55 You can output a color bar, useful for adjusting the image quality of a display. Use the [SYSTEM SETUP] button g<SYSTEM> g <COLOR BAR OUTPUT> to set the value to “ON.”

1.Press the [SYSTEM SETUP] button to display the setup screen.

2.Select <VIDEO OUT> to display the VIDEO OUT menu.

3.Select the setting item.

You use the following items to adjust the main output video.

	Setting item		Explanation
	OUTPUT RESOLUTION (	)	This sets the output format (p. 14).
	SCALING TYPE		This sets the scaling type.
	OUTPUT H. POSITION		This adjusts the display position in the horizontal
			direction.
	OUTPUT V. POSITION		This adjusts the display position in the vertical
			direction.
	OUTPUT H. SIZE		This adjusts the size in the horizontal direction.
	OUTPUT V. SIZE		This adjusts the size in the vertical direction.
	OUTPUT CONTRAST		This adjusts the contrast.
	OUTPUT SATURATION		This adjusts the saturation.
	OUTPUT BRIGHTNESS		This adjusts the brightness.
	OUTPUT COLOR SPACE (	)	This sets the color space for HDMI OUT connector
			and RGB/COMPONENT output connector.
	OUTPUT DVI-D/HDMI (	)	This sets the output mode for HDMI OUT
			connector.

You use the following items to adjust the preview output video.

Setting item		Explanation
PREVIEW CONTRAST		This adjusts the contrast.
PREVIEW SATURATION		This adjusts the saturation.
PREVIEW BRIGHTNESS		This adjusts the brightness.
PREVIEW COLOR SPACE (	)	This sets the color space for PVW OUT connector.
PREVIEW DVI-D/HDMI (	)	This sets the output mode for PVW OUT connector.

4.Use the [VALUE] knob to adjust the main output video or the preview output video.

*For setting items indicated by a “” in the table above, you press the [VALUE] knob to apply the setting.

5.Press the [SYSTEM SETUP] button several times to quit the setup screen.

15

Video Input/Output Settings

Adjusting the Input Video on Channel 4

For video input on channel 4, you can perform operations such as adjusting the image quality and setting the input format (EDID).

1.Press the [SYSTEM SETUP] button to display the setup screen.

2.Select <VIDEO CH4> to display the VIDEO CH4 menu.

3.Select the setting item.

Adjust the following setting items.

	Setting item	Explanation
	RESOLUTION (EDID)	This sets the input format (EDID).
		g“Setting the Input Format for Channel 4” (p. 14).
	SCALING TYPE	This sets the scaling type.
	H. POSITION	This adjusts the display position in the horizontal
		direction.
	V. POSITION	This adjusts the display position in the vertical direction.
	H. SIZE	This adjusts the size in the horizontal direction.
	V. SIZE	This adjusts the size in the vertical direction.
	CONTRAST	This adjusts the contrast.
	SATURATION	This adjusts the saturation.
	BRIGHTNESS	This adjusts the brightness.
	FLICK FILTER	This reduces flicker.

4.Use the [VALUE] knob to adjust the input video on channel 4.

5.Press the [SYSTEM SETUP] button several times to quit the setup screen.

Specifying the Video Output from the PVW OUT Connector/USB 3.0 Port

For the PVW OUT connector and USB 3.0 port, you		set the video
that is output to	the main output	the incoming
video for four-way split screen (channels 1 through 4).

1. Press the [IN/OUT SETUP] button to display the setup screen.

2. Select <PVW> or <USB>.

3. Use the [VALUE] knob to set the output video.

Value Explanation

The main output video is output.

The incoming video on channels 1 through 4 is output as a fourway split screen.

4. Press the [IN/OUT SETUP] button to quit the setup screen.

MEMO

55 When you use the [INPUT] or [OUTPUT] button to switch the view mode for preview output, the “PVW” setting also changes.

Using the panel lock feature (p. 39) lets you lock the buttons to prevent accidental operation.

16