PPG WaveGenerator has been updated with "bug fixes" and new support for background audio and Virutal MIDI In.

What's new:

• Virtual MIDI in
• Audio mix/ background mode
• Improvements and bug fixes

Buy PPG WaveGenerator on iTunes: $19.99

Very nice news! I hope those unspecified bug fixes address some of the problems I've heard from folks on Twitter.

Here is a recent video from beta tester Geert Bevin, showing off what's coming in the next update, with Voice-per-channel MIDI on his Eigenharp Pico.