What you are looking for is a low pass gate filter:

http://www.buchla.com/historical/b200/292-lopassgate.html

There are several DIY implementations of this filter/gate, but no
commercially available ones. Grab that soldering iron!

D.

> --- In Doepfer_a100@yahoogroups.com , "Richard Scott"
> <richard_scott@...> wrote:
> >
> > after playing with this for half an hour at Schneiders, manual in
> hand, trying and wholly failing to recreate that uniquely woody
> marimba sound from a buchla music easel i really have to ask: what IS
> this module for

--
derek holzer ::: http://www.umatic.nl ::: http://blog.myspace.com/macumbista
---Oblique Strategy # 17:
"Assemble some of the instruments in a group and treat the group"