SPL SMC - Surround Monitor ControllerThe SPL Surround Monitor Controller (SMC) is a one point analog volume control and switching matrix for system independent 5. 1 surround and stereo monitoring for essentially any audio application. The advantages of the SMC become especially apparent in combination with modern audio and video production tools such as ProTools, Nuendo, Cubase, Logic, Deck etc. One of the SMC's biggest advantages is the possibility to manage several input sources, i. e.