rubberband: rubberband  (An audio time-stretching and pitch-shifting package)
rubberband:
rubberband: Rubber Band is an audio time-stretching and pitch-shifting library
rubberband: and utility designed for musical applications. 
rubberband: It allows you to change the tempo and pitch of an audio recording 
rubberband: independently of one another.
rubberband:
rubberband: This is the GPL'led version - commercial edition available.
rubberband: http://www.breakfastquay.com/rubberband/license.html