Portable MP3 Player with Tempo Control?
Rockbox is an open source firmware replacement/upgrade, available for many mp3 players (usually, the best ones, since those have enough geeky owners to get the code ported). The last version I downloaded (years ago) had tempo adjustment but did not maintain pitch. I know people were trying to implement a tempo control without affecting pitch, but I wouldn’t know if anything came of that. (AFAIK it would be done as a software/CPU manipulation, since mp3 decoding hardware doesn’t support the feature, so it would be more likely to show up in the versions of Rockbox for mp3 players with beefy processors, like some of the ipods). Actually, that’s probably true regardless of Rockbox – I don’t think you’ll find the feature in something that is basically just an mp3 decoder chip + storage.
