Kurzweil SDROM User Manual

SD Piano Option Information

What’s in This Document

• Disk Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

• Sympathetic Vibrations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

• Changes in This Revision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

• Controller Assignments for SD Piano Programs. . . . . . . . . . . . . 3

Disk Contents

Your SD Piano option kit comes with four floppy disks, from which you’ll install operating system software, base ROM object files (for the standard factory programs), and SD Piano ROM object files. Depending on the other ROM options you have (if any), you may also need to install other ROM object files—one for each option that you have.

All of these object files are included with this kit, for your convenience. There are also two files that contain customized programs and demo songs using the SD Piano. If you like, you can load these files into RAM, using Disk mode (the other files are to be installed in ROM using the boot loader, as described in the installation instructions that came with your SD Piano option kit).

The following table lists the four disks that come with the SD Piano option, and describes the contents of each disk.

	Disk Name	Files	Descriptions
	Operating System Disk1	K26V301A.KOS	Version 3 operating system, part A; install this file in ROM
	Operating System Disk 2	K26V301B.KOS	Version 3 operating system, part B; install this file in ROM
	Factory Objects Disk	OBJKB300.K26	Program and setup information for the standard factory
			programs (IDs 1–199); install this file in ROM
		OBJKL101.K26	Program and setup information for Live-mode programs;
			install this file in ROM if you have the sampling feature
			Program and setup information for the Orchestral ROM
		OBJKO101.K26	option; install this file in ROM if you have the Orchestral
			ROM option
			Program and setup information for the Contemporary ROM
	Accessory Disk	OBJKC101.K26	option; install this file in ROM if you have the Contemporary
			ROM option
		OBJSD101.K26	Program and setup information for the SD Piano ROM
			option; install this file in ROM
		PNODEMOS.K26	Demo songs using SD Piano programs; load this file into
			RAM if desired
		SDFARM.K26	Custom programs using SD Piano sounds; load this file
			into RAM if desired.

Part No. 910357 Rev. B

SD Piano Option Information

Sympathetic Vibrations

Sympathetic Vibrations

When you play a chord on an acoustic piano and hold down the keys while the notes decay, the dampers on the corresponding strings remain up, and you hear a particular set of harmonics that evolve from the undamped strings. You don’t hear any significant harmonics from the other strings.

If you play the same chord and hold it with the sustain pedal, you’ll hear a much different, richer set of harmonics as the notes decay. That’s because all the strings are undamped, and each string gradually begins to vibrate at its resonant frequency, in response to the vibrations of the strings struck by the hammers.

This phenomenon is called sympathetic vibration, and is an important component of the sound of an acoustic piano. The most noticeable of these sympathetic vibrations come from the strings whose fundamental pitches match the harmonics of the strings that were struck by the hammers.

To create a more realistic acoustic piano sound for the SD Piano option, Kurzweil sound engineers have developed special effects settings that imitate sympathetic vibrations. When you’re playing one of the SD Piano programs with ID 700–713, and you’re not using the sustain pedal, the K2600’s audio signal passes through FXBus 1, then to the AuxBus, which applies a typical room or hall reverb.

When you use the sustain pedal, the signal passes FXBus 1 and FXBus 2 before going to the AuxBus. FXBus 2 applies a chain of reverbs programmed to resemble an acoustic piano’s sympathetic vibrations.

You can use the Data slider (or any physical controller sending MIDI 6) to adjust the level the sympathetic vibration effect.

Modifying SD Piano Programs

If you want to change the room ambiance on an SD Piano program without losing the sympathetic vibration effect, use the Studio Editor to assign a different effect on the AuxBus of the studio used by that program. If you want to remove the sympathetic vibrations, remove the effect from FXBus 2.

Changes in This Revision

This is Revision B, which includes two changes relative to the previous revision (Revision A).

Page 1	In the table listing the contents of the disks that come with the SD Piano option, the name
	of the file containing SD Piano program and setup information is now OBJSD101.K26,
	reflecting an update to the contents of the file. The previous name of this file was
	OBJSD100.K26.
Page 1	The description of the file OBJSD101.K26 now instructs you to install the file in ROM. In
	the previous revision, it instructed you merely to install the file.

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