Yes, yes, yes and yes. Pull Shift under the Bass knob is not modeled since it doesn't sound good. Pull Lead is the channel switch. Push it in for clean, pull out for lead. The clean channel is not modeled as it sounds the same as the Mark IV clean.
Put a Tilt EQ before the amp block with a frequency of 320 Hz and a gain of -3 dB. Set the Level to +3 dB.