Hi everyone! I have a DSL 5CR with effect loop, but I'm not sure if I can use it only as a power amp, so just plug an overdrive/preamp pedal into the FX loop's return input, and nothing into the front input. In the manual I saw, that do not turn on the amp without the guitar to be plugged in. On the net I saw many people, who are using like this their amps, because it sounds better for particular pedals with build-in preamp. Can I hurt my amp lile this? Thanks for any answer!