I started with the Gaui 330X, never did get it to fly very well.

Start with the transmitter in aircraft mode with default settings.

Unplug all four ESCs and set travel one at a time by plugging each one into the throttle plug on the receiver and do the throttle end points as per instructions but without the Gaui controller.  Four times, once for each ESC.

Use the Gear switch end point to set sensitivity, I think the sweet spot is around 50 I don't remember if it is +50 or -50.  If you set the range from +50 to -50 it will be controllable with gear on or off, just have to experiment on a soft surface.  I could only get one mode to work.  Changing the endpoint changes the sensitivity.   

I finally gave up on the Gaui controller and use KKmulticopter black board and Multiwii Paris 4,  Just started using the MiKroKopter.

I was initially intimidated by all the stuff involved with MiKroKpter but decided to give it a try when I seen the new Groupner transmitter which I have on order.

Ed