So I got my Mark IV a week ago and I'm extremely happy with it. Within four days I got a sweet Old Metallica "Kill 'Em All" type sound. This setting i got only sounds great when my Lead Master is at 0.5! It's great for practicing at my house cause i just crank the Main Volume Knob but I need it louder for jams with my band even though this amp is 180 watts or so LOL. Every time i move the Lead Master switch to 3 or so which is fine for jamming with my band the whole sound changes. Is there anyway to keep that "old" bright sound at high volumes without it having so much bass. BTW bass knob at 0 or 2 doesnt help.