This audio player can change playing speed.
Audio files are transfered via Wi-Fi by SyncDocs.
.wav and .mp3 are available.
SyncDocs
http://sourceforge.net/projects/syncdocs/
Speed range
50% to 200% (normal mode)
50% to 150% (time stretch mode)
-100% to 200% (turn table mode)
Time stretch mode conserve frequency (height).
Caution!
You cant play files in iphones Music Library directly.