Radial Engineering StageDirect Active DI Box w/ Footswitch Mute and Tuner Out Active DI with footswitch mute & tuner out Silently switch instruments on stage without noise Eliminates feedback when instrument is not in use Remote control lets stage tech perform switching The 'extra' comes by way of a dedicated tuner output and footswitch that mutes the signal going to the PA and stage amplifier while leaving the tuner output active