What are the FX send/Returns for on the VM Pro?

The FX loop is only in the monitoring section, it can only be heard on the input signal when monitoring via the headphones, this is to alow you to add effects such as reverb to the input signal whilst tracking. This effect will not 'go to tape' as it were and will not effect the main output of the unit.

The Inset and send will effect the recorded signal, and operate as any other insert would in a recording channel.