The 5150 III on the Blue channel can be dialed for a low gain Crunch kind of tone that even cleans up fairly decently, but you only have from about 0 to 1.5 on the Gain dial's range to get that kind of sound.
It's not something most people bother with, but if you absolutely had to dial it in that way, it can be done. Here's a clip with the Gain on maybe 1, maybe slightly less. Not 1:00, but 1 out of 10. The slow change from clean to dirty is done entirely with playing dynamics and pickup selection, starting on the neck pickup and flipping to the bridge pickup towards the end.