This is for one 2hp module that can be configured in four different ways. It's a bit complicated to get your head around, but there are no electronics on this. It's just a means to connect various buses to jacks.

1) Bus outputs - In this mode you get all stereo outputs for all four buses. This mode is best for using as an extra set of outputs for Bartender or for connecting to a chain of Barbacks (no need for a Bartender). It's also a way to get 3.5mm output jacks for the CUE bus.

2) Bus outputs w/return (no cue) - This is similar to the first mode but you flip the panel over and use jumpers on the back to convert the CUE outputs in to a return.

3) Channel outputs (1-4) - This mode allows you to get unbalanced outputs for four stereo channels of either PRE or POST.

4) Channel outputs (5-8) - This is identical to the third mode, but you just flip the panel over to get markings for channels 5-8.