I have a Flip Ez board (http://witespyquad.gostorego.com/flight-controllers/flip-mwc-flight-controller-ez.html), which is generally working beautifully but having trouble getting SUM PPM working. I have a FrSky D4R-II receiver, which I've enabled fine in CPPM mode (I have it working OK on a different/nanowii board), except can't get it working with this flight controller.
I've enabled:
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#define SERIAL_SUM_PPM ROLL,PITCH,THROTTLE,YAW,AUX1,AUX2,AUX3,AUX4,8,9,10,11
However, I don't know where the PPM is expected to "go in" on this particular board.
The board looks like this:

and has pinouts like so:

I presumed that D2 (Throttle) would become the PPM input, however, when I connect things up to MultiWiiConf, it looks like it's expecting standard PWM. I tried switching the RX back to PWM and sure enough, that worked fine (ie: the MultiWii is still accepting PWM on this input).
I've also tried uncommenting
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#define PPM_ON_THROTTLE
I've done a fair amount of google but struggling a bit (I'm fairly new to this) to work out how to configure things/determine where PPM is expected on this board.
Any advice of where to look/how I might work things out more than welcome.
Thanks heaps!
Bickie.