Finally got back to re-visiting this issue. I have 2 iPads connected each to an IconnectMIDI2. I have them in turn connected out to in from each. I have a sample page with 8 MIDI buttons that are sub controls of a slider, making them part of a button group. As I press a button on one iPad, the same button on the other iPad lights up as expected, but I am now getting double MIDI commands to my playback system - like the button on the receiving iPad is echoing the command... am I missing a setting somewhere?