If you liked the III's you should like the IVb, it's a bit more modern sounding than a III but it dials in in a similar fashion and is a bit more versatile, input gain 7 - 8 treble high 7 - 9, bass low 0 - 3, mids 2 - 4, lead drive - 8 a V on the graphic EQ. You're gonna want to experiment with the mid gain and harmonics switch and the pull fat. Some prefer it in harmonics with the pull fat engaged, some prefer it in mid gain with the pull fat pushed. Also the presence knob pulls for a shift in presence, it's a bit fatter sounding with it pushed, but more cutting with it pulled.