[sdiy] bit one

[Michael E. Caloroso]

 > cleaned all connectors. didn't make a difference. re-soldered the
 > output board. didn't make a difference. after playing around a bit
 > more, i can describe the problem a little better: something is
 > modulating everything.
 > the oscillators sound almost like they're frewuency modulated: on some
 > notes you have a pure tone, on others you have what my mono-poly in
 > fm-mode sounds like.
 > and the 'sound staying on after the eg has closed' is more apparent
 > when you open the filter. when full open there's only a slight drop in
 > volume if the key is released with the release at zero. the more you
 > close the filter, the more it dies out. also if you first select a
 > patch, you don't hear the sound. it's only after it has been triggered
 > that it won't stop anymore.  there are some things left to try: i
 > haven't taken the chips out of their sockets and clean them.. (and
 > there are 6 CEM filter chips..) and i haven't re-soldered the
 > 'analogue board' yet. though maybe it could be a digital problem..
 > what i find strange is that the sounds i send it via sysex or tape
 > save are corrupted right away.

Power supply.  Check your rails.  You may have AC riding the rails or 
the supply has gone out of regulation.  I ran into this with my minimoog.

MC