My program for the TA has the right engine on the throttle channel and the left engine slaved on the Aux 2 channel via mix6. And I am using mix1 on top of this to synchronize the left engine through the range of stick positions. It took a while, but once I got it all tuned in the engines synch just about perfectly all the way through the stick travel.

Today I copied the program and then made some changes. To drop control of the slaved motor I put both of the mix programs on the mix switch. To force the motor to go back to idle I set the sub trim all the way back, then put an offset in mix6 to compensate for the change when the mix is on. I will have to find the right position for the Aux 2 knob, but this setup always brings the slaved motor to just above the idle setting when I hit the switch. If this works well at the field then I can do the same for the right motor by moving it to channel 8 and using mix5 in the same way. Since I am using mix5 for the 2nd rudder I will have to install a Y-harness for the rudders in order to free up the mix- with the 8103 the trims are only active on mixed channels using mix5 and mix6, and I want the trims to work for both the rudders and the engines.