channel pressure conversion demo

This is a demo of the results of a small program I wrote to convert channel pressure MIDI to polyphonic aftertouch on a different channel that HW 3 uses for 2nd touch. Currently HW3 doesn't handle channel pressure for this purpose. This is a workaround that "feels" more like real 2nd touch than the velocity method. The velocity method wouldn't work here because the chord notes already have "Note On" active.