INSTRUCTIONS FOR MIDI INTERFACE
FOR EARLY POLY SYNTH RETROFITS - fitted before approx June 1990
MIDI - - -
First - a few words about Midi. Midi is an acronym of Musical
Instrument Digital Interface. It is a system for transferring
information between synths or other equipment. The information is
sent in digital format using codes laid down by the international
Midi committee.
USING THE INTERFACE - - -
When you first turn on the synthesiser you will be in what is called
omni on - poly mode. What this means in effect is that the interface
is listening on all the Midi channels at once, and will respond to
information on any of them. You can switch to omni off - poly mode by
using the program mode push button and selecting a receive channel.
What this means is that you can set the interface to respond to Midi
information in one channel only.
MODE CHANGE PUSH BUTTON
This push button has several functions :-
1) Pressing once only enters patch change mode. Any key then selects
a patch change which it sends through midi.You are then automatically
returned to playing mode.
2) Pressing twice enters program mode. This enables you to program
in such things as receive / transmit channel number information etc.
Once you have entered program mode, the interface will stay in that
mode until top C on the keyboard is pressed, and until that time, any
key pressed will change a parameter.
On the following page is a list of what each key will do if
pressed during program mode.
3) Pressing once and holding for a couple of seconds enters transpose
mode. You will know this has happened because middle C will sound,
and continue to do so until you press another key. You are then
returned to playing mode.
The note you press will be the new middle C via midi in
Transpose mode cannot be entered from program mode.
WHEN NOT USING MIDI IN - ENSURE THAT VCF/VCA SWITCHES ARE TURNED OFF
C Receive channel 1 [ Bottom C ] Midi note number 36
Db " " 2
D " " 3
Eb " " 4
E " " 5
F " " 6
Gb " " 7
G " " 8 Selecting a receive channel
Ab " " 9 will automatically put the
A " " 10 Midi into omni off mode.
Bb " " 11 That is, it will receive on
B " " 12 the selected channel only.
C " " 13
Db " " 14
D " " 15
Eb " " 16
E Not used Master reset (G) sets all
F Omni on mode (default) settings to their default
Gb Not used values. Also sends all notes
G Master reset (see note) off code through midi. Press
Ab Not used and hold down this key and
A Ignore received master reset then also press top C.
Bb Not used
B " "
C Transmit channel 1 (default) [ Middle C ] Midi note number 60
Db " " 2
D " " 3
Eb " " 4
E " " 5
F " " 6
Gb " " 7
G " " 8 The transmit channel can be
Ab " " 9 changed independently of the
A " " 10 of the receive channel, and
Bb " " 11 can be set even during omni
B " " 12 on mode.
C " " 13
Db " " 14
D " " 15
Eb " " 16
E Not used
F Transmit Key on velocity decrease :
Gb " " " " normal (default) :
G " " " " increase :
Ab Not used
A Transmit Key off velocity decrease :
Bb " " " " normal (default) :
B " " " " increase :
C Receive program change (default)
Db ignore " "
D receive mod wheel (default)
Eb ignore " "
E receive pitch wheel (default)
F ignore " "
Gb receive after touch (default)
G ignore " "
Ab send velocity information to vcf/vca (default)
A send nothing to vcf/vca
Bb send controller 4 information to vcf/vca
B send aftertouch to vcf/vca (instead of to modulation)
C ENTER key - Press and release. [ Top C ] Midi note no. 96
MIDI CONTROL OF RED PUSH BUTTON
The red push button can be "pressed" via midi as midi switch number
95 (5Fh) for regular program mode or 94 (5Eh) for transpose mode.
The selection of the push button is enough, it doesn't matter if it
is being turned on or off.
In hexadecimal BX - 5F - 00 = program mode
In hexadecimal BX - 5E - 00 = transpose mode
Where X is the current midi channel.
[n.b. whilst in program/transpose modes the midi is in omni on mode]
MIDI CONNECTORS - -
MIDI IN should be connected to a MIDI OUT or a MIDI THRU
similarly MIDI OUT should be connected only to a MIDI IN
and a MIDI THRU should also be connected only to a MIDI IN.
MIDI OUT is the signal from the synthesiser (or drum machine etc.)
that is to be sent to another instrument. MIDI IN is a received
signal that contains MIDI information from another synth, and MIDI
THRU is an exact copy of information arriving at the MIDI IN socket.
This allows several instruments to be connected together.
If you want to wire your own MIDI cables the following information
may be useful.
1) Although a 5 pin connector is used, only two connections plus an
earth connection are required.
2) If you look at the din plug from the wiring side you will see
that the pins are numbered. From left to right (or clockwise) these
are 1 - 4 - 2 - 5 - 3.
3) The pins numbered 1 & 3 are not used.
4) The screen (earth) is connected to pin 2 (centre pin)
5) Pin 4 of one plug should be connected to pin 4 of the other
6) Pin 5 of one plug should be connected to pin 5 of the other
7) You should now have a working Midi lead
8) It is preferable to label one end of the cable MIDI IN & the
other end MIDI OUT, to avoid confusion.
Copyright (c) KENTON Electronics & John Price 1986 - 1990
Kenton Electronics
Surbiton
Surrey
www.kenton.co.uk
Software version 3X42
9007010900
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