mdbooker

I just purchased the M13 I am using the 4 cable set up into a tubemeister 18. When I set up my scenes I tried Post fx 1 2, etc but the effect postfx all sound dirty when I set up using (Pre all ) setting in the scenes screen everything sounds perfect amp and effects? But I don't understand way all the effect sound distorted when setting effects in postfx in the scenes screen? Is there possibly something wrong with my M13, I purchase a floor model?