There is also a small mod you can do to the effects loop in which you can add a small two pole switch ,it bypasses the buffers and gives a slightly cleaner path in bypass mode. Nearly all amps with extra high gain available such as boogies lack something when compared to a less busy circuit. Another thing about the dual rect is theres lots of options and I had a few customers who found it difficult to pick and stick to a particular setup ,sometimes less choice is better. Id also second the opinion that simple changes in component types and not values wont bring about much change in tone . Fine tooth comb the mods already done by people on this model ,then once youve found the ones that go in the direction you want ,incrementally add the various components one at a time until you get to where you want to be . Its also not the easiest board to work on due to the hard wired nature of the pots, switches and jacks, could be a safer and easier bet when replacing caps to leave some mm's of the original component legs rather than desoldering/resoldering directly to the board.