Koch DJ-1 MIDI switcher adapter

Via the Koch DJ-1 adapter, you connect a regular MIDI switcher to a Koch amplifier, and then use it to control functions such as channel selection and rhythm/solo volume. Only requirement is that the amp has a 7-pin DIN input for Koch's own footswitches. So instead of a Koch footswitch, you now use this adapter in combination with a MIDI switcher with 6.3 mm jack connectors.