ORIGINAL: GTX SlotCar

OK. I just went through this again.
The left trimmer pot is for the gyro gain. The right pot is the motor mixer. It seems to operate in a counter intuitive nature in that a CW adjustment will spin your heli CCW. So, the easy way to remember it is that if your heli IS spinning CCW, turn the trimmer CCW to correct it.

Turn the left trimmer (pot) all the way down (CCW). This basically shuts off the gyro.
Center your rudder trim.
Fly the Lama for a couple minutes to let the motors (and 4in1) warm up.
If the heli is spinning CCW, turn the right trimmer (Proportional) CCW.
If the heli is spinning CW, turn the Proportional trimmer CW.
Keep doing this until the Lama stops spinning on its own, or get it as close as possible.
Once this adjustment is as good as you can get it, increase (CW) the gyro gain on the Gain trimmer. Small steps are best. This locks the gyro. but too much lock will cause the tail to shimmy back and forth as it "hunts" for center. It will also probably slow down the speed of the tail so you won't be able to spin it as fast.