BACKTRACKIT - Manipulate audio Plus some other features

For free and with no pubicity this should be a no-brainer for practising musicians...

Google Play info:
https://play.google.com/store/apps/details?id=com.superpowered.backtrackit&hl=en

- Detect and Shift the Key and Tempo of any of your songs!
- Remove the leading instrument in the song. This can be the Vocals so you can sing along or a Guitar solo so you can practice along!
- Guitar/Piano display of 16 musical scales in any key!
- Chords viewer: check the position of more than 140 chords!
- The App gives you control over the Bass/Middle/Treble of the song.
- Save the song as a karaoke track with new tempo, pitch and EQ settings! 
- The App will sort all of your songs according to their key or tempo.
- Loop any part of the song! The loop is gapless.
- Overlay Guitar scales over any App! This is great for jamming over a track on YouTube.

Backtrackit gives you the best audio quality when the pitch is shifted or the tempo is changed. When the pitch is changed, the tempo remains the same due to time-stretching technique. 

Backtrackit is Superpowered.

The App is still under development. Please report bugs so we can fix them.