I have been using touchOSC to make a controller for the Helix using MIDI over USB. Getting the app to control a parameter has been very straightforward - on the Helix press in the knob for a parameter, select the parameter to be controlled, press Learn Controller and then activate the desired controller in the app. I have been using Kinky Boost because it only has 3 parameters and it is straightforward to control them.   So transmitting MIDI from the controller works great. But I would really