The other nice thing about the Metropoulos loop is that it can be setup with a switch from -10db to +4. This lets you use pedal effects which are typically -10 and rackmount studio gear ala Eventide H3000 harmonizers and TC2290 delays etc. Very handy especially in the studio.
I have a Metropoulos amp with the switch. I assume the kit has the possibility for the nominal level switch…