FX Loop issue

Hello!

I’m having some issues with the “FX Loop” block. I’ve connected my Quad Cortex to my amp using the “4 Cable Method” (+ “FX Loop” block), but it doesn’t sound very good.

  • If I set the amp’s FX Loop in “Serial Mode”, I get a very low volume but distorted sound.
  • If I set the amp’s FX Loop in “Parallel Mode”, I get “dry” post effects.

I think it is related to the “FX Loop” block in Quad Cortex.

Could anyone explain me the different choice options for that “FX Loop” block, please?
On the other side, connection scheme and “FX Block” advised on the manual… Are they correct?

Best!