Sequential Circuits SixTrak

[cmorpheus]

This would be a great enhancement to this synth, as all parameters are accessible.
There could be tabbed pages for controller and setup, perhaps.

MIDI info that I could find is here:
http://www.synthzone.com/midi/seqcirc/sixtrack/

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Six-trak MIDI Implementation – partial. (December 28, 1983)

Received Data

STATUS DATABYTE #1 DATABYTE #2
(hex/binary)

Bn/ 1011 nnnn parameter # parameter value Parameter Change
(if enabled)

Bn/ 1011 nnnn 01/ 0000 0001 mod amount Modulation amount
(if enabled)

Bn/ 1011 nnnn 7A/ 0111 1010 00/ 0000 0000 Local off

Bn/ 1011 nnnn 7A/ 0111 1010 7F/ 0111 1111 Local on

Bn/ 1011 nnnn 7B/ 0111 1011 00/ 0000 0000 All notes off

Bn/ 1011 nnnn 7C/ 0111 1100 00/ 0000 0000 Omni Mode off,
All notes off
(Mode 3)

Bn/ 1011 nnnn 7D/ 0111 1101 00/ 0000 0000 Omni Mode on,
All notes off
(Mode 1)

Bn/ 1011 nnnn 7E/ 0111 1110 00/ 0000 0000 Mono Mode on/
Poly mode off,
All notes off
(Mode 4)

Bn/ 1011 nnnn 7F/ 0111 1111 00/ 0000 0000 Poly mode on/
Mono Mode off,
All notes off
(Mode 3 ?)

---

SYSTEM EXCLUSIVE

(hex/binary)

Program Dump request:

F0/ 1111 0000 (SysEx start)
01/ 0000 0001 (SCI id)
00/ 0000 0000 (Request)
pp/ pppp pppp (Program #)
F7/ 1111 0111 (SysEx end)

---

Program Dump Receive:

F0/ 1111 0000 (SysEx start)
01/ 0000 0001 (SCI id)
05/ 0000 0101 (SixTrak id)
pp/ pppp pppp (Program #)
data (16 bytes, transmitted as 32 4bit nibbles.
See table 1, page 10)
F7/ 1111 0111 (SysEx end)

---

Select Double Mode:

F0/ 1111 0000 (SysEx start)
01/ 0000 0001 (SCI id)
7B/ 0111 1011 (Select Channel)
0c/ 0000 cccc (channel #)
F7/ 1111 0111 (SysEx end)

[This message sets the basic MIDI channel to ‘c’. It also enables wheels,
program change, and parameter change send/receives and selects Mode 4
(Omni off/mono on).]

---

Wheel enable:

F0/ 1111 0000 (SysEx start)
01/ 0000 0001 (SCI id)
7C/ 0111 1100 (Enable)
0v/ 0000 vvvv (Voice #)
F7/ 1111 0111 (SysEx end)

[If Mode 4, enables wheels on voice ‘v’.]

---

Wheel disable:

F0/ 1111 0000 (SysEx start)
01/ 0000 0001 (SCI id)
7D/ 0111 1101 (Disable)
0v/ 0000 vvvv (Voice #)
F7/ 1111 0111 (SysEx end)

[If Mode 4, disables wheels on voice ‘v’.]

---

Enable all MIDI send/receives:

F0/ 1111 0000 (SysEx start)
01/ 0000 0001 (SCI id)
7E/ 0111 1110 (Enable)
F7/ 1111 0111 (SysEx end)

[This forces all send/receives to be enabled, including wheels, program
changes, and parameter changes.]

---

Six-trak parameter table:

Controller # Parameter name # of bits
resolution

1 Mod wheel 5
2 Osc coarse freq 6
3 Osc fine freq 5
4 Osc glide rate 4
5 Osc LFO (off/on) 1
6 Osc env amount 4
7 Osc env invert 1
8 Osc env attack 4
9 Osc env decay 4
10 Osc env sustain 4
11 Osc env release 4
12 Osc sawtooth 1
13 Osc triangle 1
14 Osc pulse 1
15 Osc pulse width 6
16 Osc pulse lfo mod 1
17 Lfo freq 4
18 Lfo prog amount 5
19 Lfo tri/square wave 1
20 Osc/noise mixer 5
21 Filt cutoff freq 7
22 Filt resonance 6
23 Filt env amount 4
24 Filt env invert 1
25 Filt env attack 4
26 Filt env decay 4
27 Filt env sustain 4
28 Filt env release 4
29 Filt lfo mod 1
30 Filt keyboard amount 2(off/half/on)
31 Filt-osc tri mod amount 6
32 Amp attack 4
33 Amp decay 4
34 Amp sustain 4
35 Amp release 4
36 Voice volume 4
37 Unison 1

All controller data (apart from the Mod wheel) is Left justified (ie a 1
bit number actually toggles between 0 and 64 rather than 0 and 1)

[atom]

Sure, i’d love to do that, i’m a big SCI fan i have a MultiTrack but it does not have any MIDI that can be useful, but i’ll do a sixtrak, it looks simple enough.

[atom]

have a look at the beta i cooked up this sunday, post any feedback in the SCI – SixTrak forum.

[Author]

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