- The JC-120 is a very clean-sounding amp. That's what it was designed for, and its one of the best amps in the world for delivering the intrinsic sound of the guitar, uncoloured. There is no such thing as 'grind' or 'crunch', so if you really want those tones, you need a different setup. Distortion pedals don't sound 'real' through that amp.
- There is no 'Blues Tone'. Listen to enough different players, and you'll hear anything from what Clapton called the 'woman tone' (neck humbucker, guitar tone knob rolled way down), to the ice-pick-in-the-forehead kind of shrill scream that Roy Buchanan got from his Tele.
Put most of your search effort into what you do with the guitar. As you find your voice, you will intuitively understand what amp settings are best for expressing that. They go hand-in-hand. You will find yourself playing in a particular way if you EQ to enhance the treble, and you'll probably change your style to something else with a darker tone setting. I suggest starting out fairly neutral - Bass rolled off a bit, Treble between 12 o'clock and 2 o'clock. Roll off the guitar tone knobs a bit, say 6 or 7 out of 10. Then shut your eyes, and play. The sound you're looking for is in your hands.[/font]