I'm developing an app that contains a 4.80 second musical groove that loops. When played in Pd with au or aiff files the groove accurately loops. When I convert au or aiff files to mp3"s, the length varies by .05 seconds and the loops are glitchy. The mp3's played back using quicktime are not exactly the same length as the au or aiff files from which they were compressed. How do I get the mp3's to be exactly the same length as the au/aiff files? Thanks