I once had a Marshall DSL15H tube head. It was a good amp. I thought it could be great. I modded it. In fact, there are some threads here and more so on the marshall forum, that go into a lot of depth. In fact, I get asked questions periodically from current modders of the same amp. I just had one yesterday, sent him the schematics and my 2 cents. In fact, that is what put this thought in my head. I spent a bit of time tracking down the schematics, studying them, analyzing what I didn't like about the amp, forming a game plan. soldering in the test circuit leads to try different values, trying different values for caps and resistors. All of this was to take some of the amp's brightness away, so that the 2 channels, that shared an EQ, COULD share the same settings, and to tame the gain on the gain channel, and make it a little less compressed, with a little more organic 'air'. There was some time spent. I don't regret that time. It was fun. It helped a LOT of people make a good amp sound really great. But, I can do the same changes, kinds of changes on my Axe, or Kemper, to ANY amp in mere seconds. I can even play with some of the same capacitor values on the Axe. Truly mind boggling. You/we can all be amp modders at that level or deeper with this modeling tech.