1. The amp seems to have a 'mid-monster inside' - I see people getting very sparkling clean tones out of the amp, but mine just won't do it. Also I noticed the 'high' & 'bass' knobs do a lot, but the 'mid' knob only makes very little difference in the sound when turning from 0 to 10. With my 60 Strat, the mids are always over-pronounced, and I just can't get rid of them. When engaging the boost by footswitch, the only thing left is mids. It sounds like a blanket is put in front of the cab.
2. When engaging the mid-boost by footswitch, the volume doubles (at all 'master' settings). Is there any way to reduce the volume increase? As it is, the boost is not usable even when I dial in a 'rythm-volume' sound - when engaging the boost the output doubles, which is just too loud.
3. When switching from 'rock to 'jazz', I loose a lot of volume. Even with the master & input both on '10', I cannot compete with the rest of the band in the 'jazz' setting.
4. When engaging the overdrive-switch, I must set 'drive' & 'ratio' both below 3 in order not to get a volume increase in comparison to clean volume. I have seen zucker's vid's on youtube, where he demonstrates the amp with all knobs on 5, and the volume seems to be quite even on all clean & OD settings?
1. Dumble like amps are "mid-monster" and that's something many people actually like. Maybe changing the plate/cathode resistor along with the bypass caps. Maybe something like #124 amp has... That would bring this amp more into Fender neighbourhood.
If that's not your thing maybe these amps are not for you.
2. There is a way to reduce PAB boost jump. You can try 4.7M resistors instead of 22M on the switch. This lowers the amount of boost and fattens up the bass while still keeping the overall character of the normal PAB...
3. Low volume in jazz mode is normal, maybe using some good boost pedal like Xotic RC would be a good tool to use.
4. Clean OD volume jump is a fact as well. Many players (or even most of them) use these amps for the OD sound only... they never switch channels, they just use that one sound which you can't get with any other amps out there.