APM - arducopter multirotor spektrum dsm2 8ch rx
FLIGHT MODE 1 - FMODE0
FLIGHT MODE 2 - FMODE1
FLIGHT MODE 3 - FMODE2
FLIGHT MODE 4 - GEAR1
FLIGHT MODE 5 - MIX1
FLIGHT MODE 6 -MIX2
Throttle Hold style switch(handy for helicopter guy like me) - the quad goes in stabilize and 0 throttle
DR RUDD 0 = FLIGHT MODE 1 (you should put stabilize as first flight mode) + Throttle = -125 (I have this model for a 250 quadcopter where i set NO SPIN when armed. If your propellers spin when armed you should add a left rudder for disarming). I suggest to put NO SPIN when armed in Mission Planner so you don't have to mod anything here.
ELEV DR1 = channel 7 enabled
AUX5 is channel 6
AUX4 is channel 8
AIL DR1 = reset timer (source of timer is channel1 which is throttle for spektrum)
The wiring from apm to rx needs to be done accordingly to APM's documentation.