Hi Jim. J> But I'm stuck trying to figure out how to use a reverberator with J> a scheme process instead of with-sound. When using sprout, options you would pass to with-sound may be added at the end of the call, ie: (sprout (call_myexamp 40 .15 .10 500 2000 0.5 48000) "mytest.wav" :reverb jc-reverb) Cheers, -anders