MP3 files are condensed files, so you may get some timing issues because of the compression that takes place to MP3 from wave. I thought you were importing standard wave files at 16/44.100, my bad. I always use wave files when working on collaborations via www.

If you are importing into RealBand or PT, you would want to know the original BPM Tempo that the person used during their recording. Otherwise, you are doing the job of the ACW, so to speak.

I hope you are not working with something where they pressed the record button and just started recording? Sorry if I misunderstood what you are trying to do.

Trax