The Marshall 6-Way Foot Controller for JVM4 and DSL40CR/100HR Amplifiers gives you a simple way to switch modes on Marshall JVM4 and Marshall DSL40CR/100HR amplifiers.
With this footswitch, you can switch between the following modes with a tap of a toe: Clean (classic green), Crunch (classic red), OD1 (ultra green), OD2 (ultra red), Master 1 / Master 2 (toggle), and FX Loop on/off.