This switch was used in the following Marshall amp models for the following functions.
- MID BOOST SWITCH CLEAN SW2 CLEAN/OD SWITCH SW1 OD/CRUNCH SWITCH SW3 DEEP SWITCH OD SW2 DEEP SWITCH CLEAN SW2 V.P.R.SWITCH SW3 OUTPUT MUTE SWITCH SW4 LOOP LEVEL SWITCH A SW2 LOOP LEVEL SWITCH B SW3.
- Classic Channel Boost
DSL40C and DSL100H:
- SW2 (Channel Select), SW3 (Lead1/Lead2), SW5 (FX-Loop ON/OFF).