Howdy!
I know this has been covered numerous times, but I wanted to share my experience. Yesterday I connected my Kemper Stage Monitor Out into the effects return on my Fender Tone-Master 100 watt amp head. The amp is connected to a 4x12 Tone-Master cab with V30's. The profiles I'm using are of the Fender Tone-Master head. I disabled the Cab block as recommended by others and the tone is super thin and sounds like a buzz-saw. As soon as I enable the Cab block, the tone is much warmer/thicker. What is going on? it's almost as if the Cab block on/off is reversed.
Cheers,
Rob