Hi bud.
I think you are talking about reamping dry guitar signals though effects. I am not reamping, but adding the input/output for external routing
I tested a little last night, and what I have found is if I have input 6 and output 3 set to route out via any rack gear, after turning the knob on the front of the rack, I get random feedback/bassy sounds.
I have tried gain staging and using the -10/+4 to check I am not overcooking the input but no luck.
Tried it with multiple inputs, and multiple rack gear to the same effects.
I am going to install the Axe FX again and test.
I am loathed to say it’s the interface as these things tend to turn out to be user error, so I will confirm back after I have tested.
For the record, the speaker buzz stopped last night! I’ll see how that progresses today.
Seems getting rid of the Axe Fx to simplify things didn’t work out well lol
Cheers
Mike