I just picked an old FW P51 Old Crow(box has Iron Ass on it) and I'm trying to get the sound to idle. Youtube MRC video says sound system needs 0 volts or it produces sound. I have a DX9/AR630 receiver and I have set throttle trim, subtrim, played mixing the Sound throttle to the throttle - nothing works. Sound still comes on about 30% when throttle is off. Talked to Spektrum tech guys who says it's not voltage it's PCM that is the signal! No, voltage meter goes from 0.3v to 5.3 volts output from receiver throttle channel when throttle is low to high. Any one know how to get an AR630 throttle channel down to 0 volts when throttle stick is off?
