ok:

your problem might be this:
when you load up a wave file in fruity, and say.. put a bar down in the piano roll to "play" it, it plays the whole damn thing.

you need to go into the little channel window and look at your VOL envelope: note: MAKE SURE that the lines of the envelope are RED, not purple. if they are purple, you are in "tension mode"

**turn all the knobs to the left all the way, except sustain (which should be at full), and release (which you can adjust to your tastes)

now that the envelope is on, if you put a short note in the piano roll, it will stop playing the sound file at the end of the note.

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