If you look in the manual pg 22 it shows the frequency curves for each adjustment. I think the highest frequency tone control is centered on 8 kHz. Some say that's whre the typical harshness is. In my experience it wasn't or at least it didn't tame what was bothering me. For someone concerned about highs I would suggest either the C45 or the c2300 (also pg 22 of the manual) which have standard treble single-knob adjustments. I ultimately went with a c2300 for the tube front end and found the treble worked well. The Mc gear already does a good job with highs and ultimatly I found I didn't use it all that much - maybe on no more than 10% of my recordings.
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