All modules have a vertical 10 pin connector on the back, in the central area. All modules used in the mixer must be linked.
There are 4 audio buses:
Master bus (stereo, main output)
Cue bus (stereo, planned for monitoring purposes but can be used as a stereo group)
Send A (mono, usually used for FX processors like reverb, delay, etc.)
Send B (mono, same as A)
photo by Hallmar Gauti