Due to the fact that the Six-Track was one of the first MIDI instruments, and the fact that the MIDI specification (at the time) was quite primitive, the Six-Track's MIDI modes may be considered confusing. The following is an explanation of some of the MIDI idiosyncrasies of the instrument.

[The following was taken from SIX-TRAK MODEL 610 OPERATION MANUAL----by Stanley Jungleib]

Mode Notes

The 610 powers-up in Omni Mode (Mode 1). The Channel Number can be changed from the front panel (see Parameter 36 under Coded Functions). The Channel Number is ignored while in Omni On Mode, except for the Omni Off command. Mono On commands are ignored in Omni On mode (i.e., Mode 2 is not recognized). On power-up, only Note On/0ff and Program Dump messages are sent and received. Wheel changes and program changes can be enabled from the front panel (see Coded Functions).

When Omni Off is selected (Mode 3), all messages without the Basic Channel number are ignored.

When Omni Off and Mono On (Mode 4), the 610 will assign one each of its six voices to channels N to N+5, where N is the current basic channel. Note that this will normally mean channels 3 - 8 (n = 2 - 7). Note also that the basic channel must not be set above 11, to allow room for six voices. When Mode 4 is selected, it will automatically be set to 11 if the channel is higher.

If Omni On is selected while Mono is On, Poly On/Mono Off will automatically be executed.

Basic Channel number can be changed by selecting PARAMETER #36, and adjusting for a value for 1 - 16. The channel number is non-volatile. It will remain as selected even through power off. The Basic Channel is set to 3 at the factory.

Note that the Basic Channel number is sent with transmitted data.

Coded Midi Functions

While holding the RECORD switches, press the indicated SELECT switch. CONTROL RECORD is on the right. TRACK RECORD is on the left.

Modes

• Mode l--Omni On/Mono Off TRACK RECORD/SELECT 1
• Mode 3--0mni off/Mono Off TRACK RECORD/SELECT 3
• Mode 4--0mni Off/Mono On TRACK RECORD/SELECT 4

Dumps

• Dump Current Sequences and Stacks
  CONTROL RECORD/SELECT 0
• Dump Current Program
  CONTROL RECORD/SELECT 2
  This sends 16 bytes of the program data of the program currently displayed.
• Dump 100 Programs
  TRACK RECORD/SELECT 9

Control Options

• Change Channel #
  Select PARAMETER #36. Switch VALUE on and adjust VALUE knob to select desired channel (l - 16). Note that in Mode 4, channel 11 is the maximum usable channel. Channel number can also be changed remotely by a Select Double Mode command over MIDI.
• Select Double Mode
  TRACK RECORD/SELECT 2
  For 610/610 or 610/210. In the master instrument, enables wheel changes, voice-to-voice program changes and note information (Mode 4). Selects Channel 11 if set to higher. Sends SYS EX 7B Double Mode Command to slave, to effect similar changes.
• Select MIDI Clock Input
  Turn SPEED knob fully counter-clockwise
• Enable/Disable Program Change
  CONTROL RECORD/SELECT 1
  This toggles Program Change over MIDI, send and receive. On power-up, Program Change is disabled.
• Enable/Disable Wheels and Parameter Changes
  CONTROL RECORD/SELECT 4
  This toggles PITCH and MOD wheel send/receive and Parameter changes (receive only) over MIDI. On power-up, disabled.
• Local On
  TRACK RECORD/SELECT 7
  Enables the 610's keyboard, switches, and wheels. Enabled on power-up.
• Local Off
  TRACK RECORD/SELECT 8
  Disconnects the keyboard, wheels, and switches from the sound-generating circuitry. The information will be sent over MIDI, but only MIDI received data will play the 610. This code will be ignored when the sequencer, arpeggiator, or stack mode is on.

[information from SIX-TRAK MODEL 610 OPERATION MANUAL, by Stanley Jungleib, (Manual No. CM610A Issued: December, 1983, ©1983 by SEQUENTIAL CIRCUITS,INC. All rights reserved.) courtesy of Lloyd Schoenbach, from the archives at Hyperreal]