> I tested it by generating a 30s tone, then repeatedly applying the
> effect with -5%, -5%, -7 semitones, +9 semitones. After about 20
> iterations, successively slower each time, it just comes to a situation
> where the prog dialog is not progressing.
>
 
I tried 30+ iterations on vista and didn't get a freeze.

Tried a few full songs on loop a few times and no crashes, but then again, I have only managed to crash once on my system this whole time.