Low end (boomy sound) & resonance

I am running QC via 4 cable method:

  • Guitar >> QC input
  • QC output (output 3/4) >> FX Return of an amp
  • FX Send of an amp >> QC return
  • QC send >> input of an amp

All amp models presets go to output 3/4, CAB/IRs are globally bypassed.

After changing to Output 4 instead of 3 things drastically changed…no idea why. I think I am getting somewhere (with your guidance).

Now a bit of high gain, while playing with input/output levels. Pickup in use - Gibson 500 T (it is super hot with output around 17 kiloohm), while before all the booming effect was coming from Strat with single coils (Yosemite, output 8.9 kiloohm)