Music Speed Changer changes audio tempo (speed) and pitch in realtime quick and easy. Just select an audio file, mark the region you want to play (and loop/repeat) and change tempo and pitch on the fly.
Use cases of Music Speed Changer are for instance: practicing guitar and other music instruments, transcriptions, change the speed of audiobooks, language learning…

Features:

• Change pitch and tempo (speed, time-stretch) independently
• Loop region
• Select region
• Import various formats including mp3, wav, m4a, ogg, aac, …

Features of the full version:

• Available here: http://www.amazon.com/gp/mas/dl/android?p=com.teapps.musicspeedchanger
• HQ audio output
• Support for arbitrary pitch (even deviating from semi-tones)
• Filtering
• Export to wav and mp3
• Volume amplification
• Channel selection
• Ad free

Questions, ideas, feedback? Just drop us a line using the email address or contact form on http://www.mobwheel.com/contact