[sdiy] MIDI DCOs

[WeAreAs1 at aol.com]

In a message dated 1/8/04 2:46:45 PM, WeAreAs1 at aol.com writes:

<< Hmm.. Doesn't Analogue Systems make some sort of module that does 
something 
like that? >>

Err.. I meant Analogue Solutions.

BTW, a Sequential Prophet 2000 or 2002 could be a good starting point for 
such a module, since it has 8 *hardware* voices.  Very easy to tap the 8 signals 
into 8 separate outputs.  Much easier, actually, than on a Roland S-550, which 
already has 8 outputs, but would not have the correct voice-to-output 
allocation scheme for this application.  (the 550 does not have separate hardware for 
each of its 16 voices -- those voices are all generated in one big IC, and 
then demuxed to the 8 outputs after coming out of one single DAC)  The S-550 
might work fine for monophonic/multitimbral uses, but not for chordal/polyphonic 
playing, whereas the Prophet 2000 would allow either.

You know, the Prophet 2K may even already have a per-voice gate signal (or 
something like that) available at each of its 8 sample playback IC's.  If not, 
it would be simple to use its eight VCA control signals (set as a simple organ 
envelope) as gates.  You could use the Prophet 2000's pitch wheel ADC to 
introduce (polyphonic) bend CV, too (the P2002, being a rack unit, does not have 
pitch or mod wheels, but it may still have the ADC on its circuit board, and the 
2000 and 2002 use the same OS ROM).

Also, the old Akai S900 had 8 hardware voices and 8 separate outputs, as did 
the Korg DSM (the rackmount version).  I don't know if either of their 
voice-to-output allocations would work right for this use, though.

Michael Bacich