App info is currently processing and/or the app is not yet fully available for sale on the US App Store.
"Most people are aware that GarageBand offers both MIDI and Audio multitrack recording on the iPad - but it's not available for the iPhone, and there is no suggestion from Apple that it ever will be. This is where Sydney based singer/songwriter/programmer John Vella enters the picture - he has produced the "first fully functional recording studio environment on the iPhone platform", and as you look through the rich feature list his claim appears quite respectable..." http://www.hitsquad.com/news2/SongCatcher-Audio-MIDI-Recording-Editing-iPhone-App/
It looks like the right app for me. Brilliant ideas always strike when you have nothing suitable to put them down.