Hmm.. I don't see any reason why you couldn't have one MediaNode manage several V= ST if you would like to manage them all in a single thread. Also, it's p= ossible to have multiple MediaNodes all serviced by the same thread. (not= too normal I don't think) Andrew ------------------------------------------------ Hi, I don't think the MediaNode system in BeOS is good for this purpose. The MediaNodes are good for inter-program works; I think Frans is looking for an intra-program system to process sound busses. We have a VST wrapper, but try to load and link ten addons out of a MediaPlayer, and then try to load these VSTs out from SoundPlay. With MediaNodes you have >10 threads with SoundPlay only one. RealtimeFX is a good idea, but i think that beos should also support the universal standards of the computer music world. Andrea.