[sdiy] interesting digital circuits

[Cornutt, David K]

I've played a bit in Csound with some things that
could also be done with a parallel I/O digitizing
setup.  For example, "stuck" bits: Try tying one
bit on the input to logic-high or logic-low, so
that the value of that bit never changes.  In my
Csound experiments, I've run sine waves ramped down
in level through this, starting with full level and
gradually ramping down to zero.  It creates an
interesting sort of flanging effect: as the level
decreases, there's a sound like a swept flanger, then
at some particular level an abrupt change in the
timbre occurs.  This pattern repeats several times
until the signal level gets down to a low level where
the effect abruptly ceases.  

I want to try doing other logic functions on individual 
bits, but Csound lacks the necessary bit-manipulation
operators and it's very clunky to work around them.
Doing exclusive-ORs between adjacent bits could be
interesting.  Another thing that could be interesting
would be running the bits through a back-to-back
demux/mux pair, and using the wiring between the
demux outputs and the mux inputs to remap some of
the input values.