I have a SS MG50DFX (I replaced the stock Eminence designed speaker with a Celestion Rocket 50)
Clean Ch.
Bass - 9 o'clock
Mid - 12-1 o'clock
Treble - max
Overdrive Channel
Drive - 7 - 9 o'clock
Bass - 11-12 o'clock
Contour - depende sa style, CW for metal, CCW for rock, solos and blues
Treble - 12 o'clock
FDD switch - always on
Reverb - 9 o'clock