Is there a PDA that can play an MP3 file and adjust its tempo during playback? Or, is there software for a PDA platform (Windows Mobile or Palm) that can do this? I'm looking for a PDA that can playback lecture recordings that are MP3 format and that can speed them up or slow them down on-the-fly. A bookmarking feature for the MP3's would be nice also.
Is there a portable mp3 player that can adjust tempo during playback without affecting pitch?