Multi-track recorder for songwriters. Records audio from the phone microphone or from an external source via the combination headset/microphone jack. Accessory input cables and boxes are available to record live sound microphones, guitars, various instruments, mixers, or even another mp3 player. This app comes with 4 tracks which can be mixed down to a wav file for uploading to the cloud. Sound on sound synchronization can be fine tuned to match various cpu speeds.