I decided that I didn’t want to have the same thing happen to me as happened with miniMIXA, i.e. I never got around to buying a copy and no there’s no way to buy it anymore. So I bought my copy of Mixx Mobile today and played with it a bit more. So far I can report that the time stretch works well. More later.
P.S. It does seem strange that only a few months ago I was really looking forward to having a multi-track on my PDA, and now I have two!