I still can't quite wrap my head around the FX Loop +4db or -10db settings on my amp. I'm larely using my HD's modellers, bypassing my amp's preamp. I have my HD set on Line and connected via the FX Return as recommended by meambobbo's guide.
My question is, which setting should I have it on for my amp? +4db or -10db? Also, what's the explanation for it? Lastly, anybody know what's the difference between a series and a parellel FX Return on the Marshall JVM210H?
Thanks for reading!