Vocal Recorder TwoTrack Studio

Vocal Recorder is a simple but powerful two track audio recorder that allows to record high quality songs with just your phone. It's ideal for musicians who want to record instrumental and vocal tracks separately to get high quality voice and music recording. It's simple, fast and free.
Features:
- simple and fast
- loading mp3 instrumental audio
- live audio spectrum analyzer
- volume settings on each track
- music track playback to earphones while recording vocal track
- wave encoding with automatic adjustable best sample rate (8-48 kHz)
- recording in background (even when display is off)
- playback seek control
- track playback visualisation on waveform
- save/stop recording process control
- send/share a recording via soundcloud, whatsapp, dropbox, etc.
Permissions that this app needs are:
- write to external storage (to store recordings)
- record audio
- wake lock (for prevent device from sleeping)
If you have some propositions you can send them with this form: http://goo.gl/forms/0EEdkAjM8M