OK, I played with input gain. Doesn't seem to affect things at all - either direction, no better, no worse.
I found out this too many years ago.Fret buzz. Single coils exacerbate this. Treble boost (bright cap) makes it more audible. This is why pros use high action and thick strings.
You asked for ideas about this issue you're experiencing, in your OP.I'm not at a place now where I can try things, will be in a few hours
But now you're heading towards "why would you want to do that" territory. Does it matter?
Something in the power amp can't handle large amounts of treble. I want to know how to fix it.
I took your first post as "It's your fault. You're action is too low, your strings are too light, it's fret buzz."If you want help ask nicely and I will strive to help you. If you continue with the aggressive attitude I won't respond further.
I get frustrated with "Have you tried this?", when I've already written that I've tried it.You asked for ideas about this issue you're experiencing, in your OP.
Several people are trying to help. Yet you dismiss everything that doesn't match your own POV. In a rude way too.
So why do you even ask... I'm outta here.
I've owned Axes since '08, and didn't notice it until about two weeks ago (I rarely play single coils).I have this exact issue and it has persisted since my first axefx but always tried to fix it with different guitars, strings, action, and settings to no avail.
I'm not sure exactly what you mean by 'isolation'. If you mean like in a booth with me in a control room, then no. I just had the amps about three feet away from me, with me sitting on the floor in front of them.Did you put the borrowed amps in isolation? I would bet my hat that if you did this you'd hear the same thing. Amp-in-the-room comparisons are not accurate.