I have an APM1.4 running 2.7.3FW and the latest MP application.

The camera in the Hex is in a roll/tilt gimbal that is working fine. As the APM1 only has 8 outputs that leaves me with the relay to trigger the camera shutter via a CHDK Gentled link.

Testing in terminal works fine, switch's the camera on and takes the photos until stopped.

However

I would like to have channel 6 operate the relay from the Tx and thought the CH6_RELAY selection in the 'Arducopter Config' screen for Ch6 tuning was just the thing I was looking for.

But it just won't operate the relay.

Am I missing something obvious here?

or 

is this function no longer supported?

I tried looking in the Parameter List for a relevant variable but could not readily identify any that I would change with any confidence as everything else is working fine, this is the final function I need to get happening, and I did not want to screw anything up.

Have not tested the scripted waypoint triggering as yet.