Dan will have the real answer, but I've been thinking about this too. I bet you could just Y harness a Benedini right from the receiver (half going Benny, half DMD) and just connect the speaker (I think you need an 8 ohm, not the 4 Tamiyas use) to the Benedini. The DMD will still function, but without volume or speaker. Although I'm not sure how the cannon firing can be triggered.