http://createdigitalmusic.com/2013/10/a ... more-31120
The creation of Liine community member WUL, the download is covered in disclaimers, but free for registered Lemur users. (It’s also Creative Commons-licensed, though I’m sad it is marked “no derivatives” – seems it’d be ripe for knobs. If you’ve got an idea, do go ask permission.)
The app works pretty brilliantly. Now you can lie in bed and sketch out patterns and start songs, then continue editing with Push back in the studio. There’s still plenty of reason to buy the hardware: there’s no replacement for physical control, particularly when you can use Push onstage. In a live performance situation, I’m never quite as happy on the iPad as with buttons to press and knobs to turn and the like. And Push’s velocity sensitivity is a major feature.