If you have multiple Sample and Holds, you should try this:

Get a sound going. A no attack, short decay type of sound you
like and one that you can make duplicates of, corrospondong to
the number of S+Hs your system has. (one voice for each S+H).

Tune the intiial frequency of each osc of each voice in unison.
Set the VC frequency limits of each so they track to one another
(doesn't have to be exact, close will work just fine). If your VCOs
have 1V/oct inputs, you're already there).

Control each of these sounds with a separate S+H, making sure
that the clock that drives each S+H is from a different source but
that the voltage that's being SAMPLED by each S+H is from the
same source. ,Also setr the initial speed of each and VC limit of
each to a relatively close speed and limit to each other, but not
exactly. Try larger variances once you get the whole patch going.

Listen to these sounds together. It's a async analog shift
register effect, because all three (or four, or however many)
sample and holds are sampling to very much the same bit of
info, but slightly out of sync with one another.

I have three S+H's in my box. I have tried this with as little as two
though and the effect is still strong.

Fun little thing to do. You get all of the delay/echo effect of an
analog shift register, but it's not as predictable.

Always tinkering,

Peter