Again, I think we are speaking of slightly different
things. I am talking
about the time when (for example) the synth at the head of the chain has
stopped playing notes. A reverb with this as it's input would be told 'your
input is now silent'. It has a tail, of course. It can be marked silent
when it's tail is done. Once it is silent, it does not need to be
processed._
this sounds very dangerous to me.
your description sounds OK. but ... my kawai k5000 is an additive
synth with a moderately interesting FX bank. its still producing sound
for most patches long after all of its "voices" are off. if someone
were to write a plugin modelled on this kind of design, you can't
really know when the top of the chain is silent.
i have a gut feeling that this will turn out to be the common case, so
common that trying for this optimization is a mistake. i could be
wrong, of course.
--p