Follow the exact directions to connect
I wrote a scathing review earlier. This is to correct that and inform users. The only way to successfully connect the app to the G2X Four is follow the directions and use a camera USB adaptor. You need a lightening to connect to the adapter then connect a cable USB A to USB C into the device. After connection, which may take 90 seconds and after it has paired you have an app that works as promised with a good deal of flexibility in creating patches.