After looking at the assembly manual I can answer your question. The board can handle 3 Gyros, one 3 axis accelerometer, one magnetic sensor (compass), one GPS Module, one parachute trigger, 7 LEDs, one beep and two auxiliary channels (servo channels) at the same time. I’m not sure about the barometric pressure module. It seems you’ll have to disable the compass in order to use that one.

You can see the assembly manual (PDF format) and schematics (Inside the manual) of the main board at:

http://www.uavp.de/index.php?option=...d=43&Itemid=52