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RITM2 MIDI INSTRUCTION .pdf



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Installation of the Logich midi kit to the RITM2 synthesizer.
The midi kit provides a monophonic midi control to the Ritm2 synthesizer allowing it to play in
a range of 64 midi notes from F1 (#41) to G#6 (#104) with midi pitchbend (+-1 octave by default), and
VCF cutoff control by modwheel (CC01).
Bicolour LED blinks RED if any midi activity through MIDI IN port of the kit exists.
GREEN colour LED lights only for a duration of a midi note within F1 - G#6 range on an active
midi channel.
All the pin destinations are marked on the PCB. To add a MIDI THRU connector just solder the
wires from 5-2-4 pins on the kit to the same pin numbers of the DIN 5 socket.

CV connection, Switch between MIDI and Keyboard
The CV switch is needed because only one CV source can be active at a time, keyboard
(CVkbd) OR midi kit (CV out). CV out must be adjusted to give the exact same cv scale as keyboard
with an “S” marked trimmer on the midi kit. Make a clear sounding tone from synth, take a highest F
note from keyboard for a reference then send same note by midi and trim midi cv to give the same tone.

GATE connection
Gate signal doesn't need to be switched like CV, it can be active from MIDI kit and Keyboard at the
same time, so just solder the GATE wire from the midi kit connector to the gate point under the RITM2
keyboard. RITM2 Gate is a positive signal and sets to +13V when note is active.

VCF Cutoff control connection

Midi Learn
By default the midi kit is set to receive notes on the first midi channel.
Any other number from 1 to 16 can be set by turning on the midi learn mode. To do this simply
connect the LRN input pin of the midi kit pcb to ground with button or tweezers for about 5 seconds.
When learn mode is entered the red led will turn on. Now simply send any note on the desired
midi channel, the red led will turn off and kit will be set to receive notes at this channel. It will store the
value in the EEPROM memory so it will be active until any other will be set.
Sysex configuration messages
Midi channel, pitchbend range and note priority can be set by sending the corresponding sysex
message from the list below.
By default when you get the kit midi channel is set to 1, pitchbend range is set for 1 octave, note
priority for the last note.
MIDI CHANNEL NUMBER SYSEX
F0
F0
F0
F0
F0
F0
F0
F0
F0
F0
F0
F0
F0
F0
F0
F0

00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00

20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20

21
21
21
21
21
21
21
21
21
21
21
21
21
21
21
21

7F
7F
7F
7F
7F
7F
7F
7F
7F
7F
7F
7F
7F
7F
7F
7F

55
55
55
55
55
55
55
55
55
55
55
55
55
55
55
55

00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00

00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F

2B
2A
29
28
27
26
25
24
23
22
21
20
1F
1E
1D
1C

F7
F7
F7
F7
F7
F7
F7
F7
F7
F7
F7
F7
F7
F7
F7
F7

//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//

1 channel
2 channel
3 channel
4 channel
5 channel
6 channel
7 channel
8 channel
9 channel
10 channel
11 channel
12 channel
13 channel
14 channel
15 channel
16 channel

29
28
27
26
25
24
23
22
21
20
1F
1E

F7
F7
F7
F7
F7
F7
F7
F7
F7
F7
F7
F7

//
//
//
//
//
//
//
//
//
//
//
//

1 semitone
2 semitone
3 semitone
4 semitone
5 semitone
6 semitone
7 semitone
8 semitone
9 semitone
10 semitone
11 semitone
12 octave

PITCHBEND RANGE SYSEX
F0
F0
F0
F0
F0
F0
F0
F0
F0
F0
F0
F0

00
00
00
00
00
00
00
00
00
00
00
00

20
20
20
20
20
20
20
20
20
20
20
20

21
21
21
21
21
21
21
21
21
21
21
21

7F
7F
7F
7F
7F
7F
7F
7F
7F
7F
7F
7F

55
55
55
55
55
55
55
55
55
55
55
55

01
01
01
01
01
01
01
01
01
01
01
01

01
02
03
04
05
06
07
08
09
0A
0B
0C

NOTE PRIORITY SYSEX
F0 00 20 21 7F 55 03 00 28 F7
F0 00 20 21 7F 55 03 01 27 F7
F0 00 20 21 7F 55 03 02 26 F7

// lowest note priority
// highest note priority
// last note priority


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