Slowblast difficulties

Hi,

I just downloaded your SlowBlast but I've got a problem. It wavers in and out and is impossible to learn from. Is something set up on my computer wrong or is this what it is supposed to do? It makes every note echo dozens of times and it is like I am playing with the volume knob like volume swells someone might do on a guitar, turning it on then off many times in a few seconds. Any hints what might be wrong.

Thanks,
Brian