Colin, I think the best solution would be allowing the 24 analog connections to be user configurable in software. In/Out/Gate/CV/Clock/LFO/etc..
Of course this would be best, how feasible it is is another story..
On another note, when you lay out the demux board, make sure they're 1: well buffered and 2: protected against over voltage/reverse voltage..!!!
~Steve
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CV ins/outs
2010-09-03 by Steve Maietta