I understand the correct way to use an HRM is: clean/clean with PAB/overdrive with PAB - never overdrive without PAB because then the signal would be going through two sets of EQs. (I say 'never', of course if it sounds good then no reason not to!)

I was wondering if there was a way to switch out the HRM EQ when the PAB not activated to give another useful channel.

Big job? More trouble than its worth? Not a good idea? There must be a reason it hasn't been done.

Cool! Would the result be the same as a non-HRM ODS? Or are there more differences between the two amps than this?

Does anyone know anyone who has done something similar? I understand this in theory but I'd need a layout to follow if I were to do it for real.

Mcinku, that's interesting. I hear those Carol Ann amps really sing.

It's somewhat over-complicating it though I think - the thought was more about a small mod to take advantage of something that's already there, rather than building a whole new preamp channel.