This is not about applying reverb to a drum kit. It's about having 6 samples triggered when I press a key on the keyboard, and each sample being filtered, pitch bended, saturated differently, and modulating all of those parameters using LFO's, envelopes, and midi parameters. You can't do that using "outboard" effects.
Did you try to do that using soundfonts and fluidsynth? I am not sure at what extent fluid supports the modulator entities described in the spec, but these should do those tricks. HTH, Luis
