4 Tracks is the original multitrack digital recording studio for the iPhone.
Simple to use and very light (under 10mb) this is the audio tool that you can always have with you.
It was used to create full albums ( including Chris Price's Homesick).

Features :

- Record in multiple takes from your microphone or with real instruments.
- Mixdown your tracks
- Integrated synthesizer
- Onscreen keyboard
- Loads audio files and loop (AIFF, WAV, loops)!
- CD-Quality Recording 16 bit, 44.1 kHz
- Metronome allows you to create time perfect recordings (60 to 200) bpm
- Save and manage your tracks using a clean interface
- monitoring gives live feedback even when not recording so you can adjust settings.

Buying 4 tracks gives you all the new major features that will be implemented in the future.