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Yes, you can also send MIDI notes to the iMS-20.

The synth responds to MIDI channel 1, the drum parts respond to channels 2 to 7. So once you set up your clips in Ableton to send on the correct MIDI channels, you can use the iMS-20 just like a multi-timbral hardware synth.

You could try to send MIDI from your MacBook to the MicroKorg via USB, and then use a MIDI interface like m-audio's USB Uno to connect the MicroKorg's MIDI Through to your iPad.

@loopstationzebra: there's a new toy at the app store, that you might want to take a look at. It's called 'MidiPadz lite', it features drum pads, an x/y touch pad, and it even uses the accelerometer to transform the iPads x/y rotation into MIDI CC data. It supports MIDI Out via usb/CCK and also WiFi ...

I just saw that Korg have finally updated the iMS-20 online help. The new 'Changes in Version Up' section is now available, including a complete MIDI Control Chart. Edit: There is also a new v1.1 Demonstration Movie in the Video Tutorials section, showing that it is possible to connect a nanoKey ...

Works great with both an Akai LPK 25 and a Korg nanoKontrol. Does not work with my no-name USB hub, so I could not try out if it is possible to connect both of the above at the same time. Also works with my Novation Xio with extra power supply. The iPad even recognizes that the Xio's USB port is ...