Sequential Circuits SixTrak

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  • #113
    cmorpheus
    Participant
    • Topics: 1
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    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/



    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)

    #1498
    atom
    Keymaster
    • Topics: 159
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    • Total: 3104
    • ★★★★★

    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.

    #1499
    atom
    Keymaster
    • Topics: 159
    • Replies: 2945
    • Total: 3104
    • ★★★★★

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

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