As a long time (13 plus years) JVM410H owner I never felt that the crunch channel met its stated goals of offering plexi, 2203, and modded 2203 tones. The sounds on offer were all perfectly pleasant, but voiced way too rich/dark, which also led to what was a rather jarring (to me at least) change in character when switching between crunch and OD channels. The tonal differences were confirmed when I recently got lucky enough to have my JVM and a bunch of other amps, including 3 varieties of plexi (Marshall 1959, Bugera 1960 Infinium and a Blackstar Artisan 100) in the same room with a couple of hours to mess about with them. The good (great!) news is that the JVM can really nail a plexi tone (OD1 orange, gain just under 1, resonance up to around 8, presence, EQ and volume to taste). I mean it’s really, really good, and it’s definitely not in my imagination as it was tested in the same room, with 3 great sounding other amps, run through 6 or 7 different cabs. All of the above also confirm some things that I kind of knew anyway: the JVM can be made to work beautifully with any speaker, and is never left wanting, even by some very expensive competition. Anyway, the not so good news is that the crunch channel is pretty much redundant to me. So, I looked at the schematic and it’s clear that you can brighten up the crunch channel by altering a couple of things around the gain control to make its behaviour the same as the gain control on the OD channels (remove one cap, and change the value of another). However the question is, do I really want to do that? Ideally I’d make the crunch channel into a clone of OD1, as there are so many ridiculously good sounds in that channel that it would be nice to have another one, but that’s probably not feasible without major surgery of the kind that I’m not prepared (or skilled enough!) to carry out. So, what I’m after are some ideas of what I can do with my crunch channel. I’m not bothered about it necessarily mimicking this amp or that amp, but I’d like to give it a brighter, more aggressive and attacking character. Does anyone have any suggestions?