FourTrack, a well-designed app for the iPhone or iPod Touch that records, mixes and plays up to four tracks like a shrunken version of Pro Tools. There's no way it'll replace your main recording setup, but then again, you can't put your main recording setup in your pocket.
FourTrack (iTunes link) is the work of Sonoma Wire Works, makers of the desktop recording software RiffWorks, and The Retronyms, makers of Recorder, the top-selling (single-track) recording software in the App Store. After a few days of pre-release testing, we can safely say that this is a solid, functional app that justifies its $10 price for musicians and anyone else who messes around with audio despite -- or perhaps because of -- its rudimentary, four-track-like functionality.
The screenshot to the right(see continue) represents the bulk of the application, where you can arm tracks to record, set playback levels and pans, activate the recording process or skip to any point in the song by tapping the progress bar or rolling the jog wheel.
Recording and mixing are a snap thanks to intuitive controls and a record switch that requires a sliding motion, which helps prevent you from accidentally recording over a previous track. While there's no way to see waveforms, the app's live monitoring function lets you listen along to the one-to-three tracks you've already laid down, which gives enough of an indication of where you need to be within a given song. There's no gain control either, but at least you can monitor recording levels to check for clipping.
Each track can be as long as your device's memory can handle, and the program can contain an unlimited number of projects. We like that you never have to save -- everything you record gets stored automatically.
Here's a screenshot of the recording process:
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