The D-RLC3 is designed to directly interface with RDL® control modules which feature a 0 to 10 Vdc control input utilizing an external 10 kΩ resistive control, such as the ST-VCA3, RU-VCA2A and RU-VA6A voltage controlled amplifiers. The D-RLC3 has four momentary pushbuttons, each corresponding to one of four levels selected.