Audio Unit Player is a versatile music player available for iPhone that offers real-time processing effects. Users can utilize features such as time stretchdouble speed), pitch shift (-1 ~ +1 octave), 31-band equalizer, and AUv3 effects. The app caters to various use cases like karaoke training, tempo reduction for instrument practice, and key adjustments for band performances.

With Audio Unit Player, users can perform real-time time stretch%) and pitch shift (-12 - +12), utilize a 31-band EQ, access EQ presets, support AUv3 effects, and enjoy A-B loop playback. The app also offers features like center cancel, individual channel muting, fast forward/rewind, graphical position setting, Auto-Lock toggle, background playback, and export functionality for customized effects per song.