If you can’t bring the MV up, then your must be maxing the pre amp gain. I never ran the MV that low. ???Maybe I like volume more than you do??? Or...maybe those Celestions are not ‘ear pleasing’....I have found that in some speakers no matter the volume. I was able to run the amp in many different ways and mimic many different amps. fwiw, both channels can be overdriven. However, the left channel does not have the parametric mid range control or the Multifilter. Also of interest is that the High inputs were designed for high output pickups and yield a weaker signal to the preamp than do the Lao inputs. I always ran into the Lo input...even with humbuckers. I liked the gain...and with the preamp gain control set low, it was still clean. Push that coco troll, and things got hot. Great compresssion, imho. It could be used to get singing cleans if wanted.or....one could really squash the initial signal and listen to it swell in.....fun to play with and capable of giving some interesting uses.