I have been using a Gallien-Krueger 1001RB amp head for almost 10 yrs now, and have never used the effects loop. Only in the past 2 years did I add a Carl Martin compressor/limiter to the instrument cable. Otherwise I rely on the head itself which gives good sound. But now that I have been considering using chorus, eq, or distortion/overdrive pedals, I wonder if I should use the effects loop or if that is meant more for something like a line-level effects processor such as a DSP256. Would cranking too much gain from an eq or distortion pedal back into the loop cause damage? Is it more vulnerable than the pre-amp? Should a genuine overdrive pedal only be used on the input or is it ok for the effects loop as well?