What does the Blues master sound like?

[Mark]

I was having a look at the Blues Master pre-amp and the 50K midrange pot kind of freaked me out. I thought if that is turned up all the way I'm not sure the tone controls would work at all?

Looking at the circuit it seems as if the amp would have mids to burn?

I imagine the HRM tones would be thicker sounding too?

Look forward to your replies.