RubinGrolsch:
Unfortunately not, is it possible to use the arduino or some other pc program as a substitute?
I would have thought the Arduino would do that easily enough. Just write a sketch that detects each time the input changes (either by polling, or interrupts) and records the old state and interval since the last state change. When you're collected enough transitions - a couple of dozen would be enough, I'd have thought - print out the state and the duration in micros for each transition. That should be enough to show you the nature of the signal you're dealing with - I'd have thought it'd be one pulse per channel repeating at 50 Hz but the sketch will tell you either way. Do this a few times varying the position of each control and I think you'll vert soon figure out the signal format.