Unlike an MBI or PTM, MSS is paired as a whole device to the controllers via a teach button and not by individual buttons like the MBI or PTM switches. Because the MSS is not programmable, MSS station...Unlike an MBI or PTM, MSS is paired as a whole device to the controllers via a teach button and not by individual buttons like the MBI or PTM switches. Because the MSS is not programmable, MSS stations are unable to scope their control to Groups. Which means the MSS fade function can turn ON a fixture when fading up, but it cannot turn OFF a fixture when fading down. IE: Controller A has its Preset 1 level set to 80%. Controller B has its Preset 1 level set to 50%.