[sdiy] TRIADEX MUSE schematics???

[mcb, inc.]

On Sat, 21 Jun 2008, Dan Snazelle wrote:

> Does anyone happen to know where to find the MUSE schematics? I am looking for some more pseudo random sound generators to explore. Similar ideas are welcome as well.

Someone else tracked me down so I wrote up the following on the
Muse's controls (actual Muse, not simulated):

Switch Rows (data sources):

Off/On

         These are just fixed boolean values.

C1/2, C1, C2, C4, C8, C3, C6

         These are various divisions of the clock.  C1/2 is the
         fastest toggling twice per step.  C1 is the raw tempo.
         C2 is half-speed, C3 is divide-by-three.  A major use
         of these is to incorporate them into the interval logic
         which can give the resulting sequence a recognizable
         rhythm or even a distinct time signature.  C1/2
         is 'on' in the hold state.

B1-B31

         The shift register.  The pseudo-random logic generates
         a single bit which is fed into B1 shifting the other
         values down every C1 tick.


Switch Columns (data consumers):

Interval A, B, C and D

         These determine the note pitches.  An interval is
         associated with each column though how true these intervals
         are is debatable.  A '1' in A raises a second, B a third,
         C a fifth and D an octave.  This above the course/fine
         setting which establishes the 0000 base.  An obvious
         mod would be to support many cultural tunings.

Theme W, X, Y and Z

         The inputs to the pseudo-random generator.  I suspect the
         logic is:  !((W xor X) xor (Y xor Z)).  But can't prove
         this yet.  Other generators might be interesting (or not).


Other controls:

Rest

         When up, 0000 notes don't sound and become rests instead.
         Can sound better.

External

         Involves the accessory sockets.  Don't sweat this.

Start

         Momentary position that zeros the clock (C*) and shift
         register (B*) values.

Step

         Another momentary to single step when in hold mode.
         Auto mode just free runs.


Except for the external mode, verification of the pseudo-random
logic and the precise behavior of the internal steps across the
tuning range, that's pretty much the device in total.

--
Monty Brandenberg