I have almost always been an MFX in front of a Tube Amp guy (i.e effects only, no modeling/cab emulation). Pod 1 and 2, Digitech RP 350, 500, 1000 and now Helix LT. So effects loops have never really been my thing. But I find myself suddenly considering it. I have noticed and wonder why putting reverb in front of the SV20 sounds terrible but fine through the Origin 20. Even when I match the crunch levels between amps, the reverb gets amplified and distorted on the SV but not (or not noticeably so) with the Origin 20. I end up having to turn the mix down to 2-3% when using the SV to try and tame it and pretty much anywhere 10-30% (i.e. normal) when using the Origin and most of my other amps in the past. Does anyone understand why or what the SV does differently to the Origin to cause this?