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