I thought I already posted this yesterday, but I don't see it anywhere
so I'm posting it again. Apologies if it's up twice.

I'm trying to locate some software that will do the following: I
would like to be able to trigger pieces of midi info by pressing a
single key on my MIDI keyboard controller. Therefore I could assign a
different "stream" of midi info for each key. These "streams" could
range in length from a short three note figure to an enitre 20 minute
piece. Even though I know this technically isn't a sampler, it is
similiar to a sampler in the way a sound fx artist might load up a
different, say, animal sound for each key. I would like to switch
back and fourth between pieces on the fly, each time I press a new
key, the corresponding "stream" would play from it's begining, as long
as I hold it down, it continues to play, when I release the key, it
would stop. Mulitple polyphony would be nice as well so I could play
mulitpe "streams" concurently. And I would like the resulting weave
of pieces to be "recorded" into a single midi file that I cold then
take into Finale and work on. I have no standalone midi recorder, so
all this would be done inside the computer. All the info is MIDI, no
digital audio info will ever be involved. I imagine there must be
some sort of advanced sequencer that could do such a thing.

Anybody know of anything? Sorry for the verbose explanation, if no
one understands what I'm after I will try to refine the description.