Sound switch class has been added into z-wave end of 2017, the latest available SDK for zw300 chip is from march 2017 (and actually only security has been added into it, last changes to command class are from end of 2015). Fibaro HC2 does use zw300, that's why there is no way for things like     The way Aeotec support proposed is the only way to configure (all kind) not supported classes, however it will not help to capture events (unless one set lifeline to secondary controller