Have you ever connected a USB/MIDI only keyboard to a MIDI IN/OUT keyboard using a cable like this:
http://www.amazon.com/M-Audio-Midisport-Uno-MIDI-Interface/dp/B00007JRBM/ref=sr_1_5?s=electronics&ie=UTF8&qid=1383590365&sr=1-5&keywords=MIDI in/out to USB
plus an adapter like that:
http://www.amazon.com/USB-Type-Female-Male-Adapter/dp/B000AA2SMS
Do both(or at least one keyboard) triggers the other keyboard sound?
http://www.amazon.com/M-Audio-Midisport-Uno-MIDI-Interface/dp/B00007JRBM/ref=sr_1_5?s=electronics&ie=UTF8&qid=1383590365&sr=1-5&keywords=MIDI in/out to USB
plus an adapter like that:
http://www.amazon.com/USB-Type-Female-Male-Adapter/dp/B000AA2SMS
Do both(or at least one keyboard) triggers the other keyboard sound?