r2 is actually my favorite channel on the mk iv. I use it for blues, jazz, hard rock, or when I don't feel like channel switching- I hit the strings hard for distortion and back off for a clean sound. I use gain between 4-6 pulled on it, tweed, triode, class a, channel volume around 5 and master between 5-8, presence 0 in, bass 2 mid 4 treble 5, one of my favorite tones.