Quoted from TimeBandit:Depends on which way the SmartDMD is talking. Mine is only TX to the machine. So, if it was on a splitter, messages out from the machine would go to both add-ons and just be ignored by mine. If the SmartDMD talks to the machine at the same time as the sound caller talks to the machine, then the signal would be turned to garbage.
I will ping oga83 to see what he thinks... I'd have to think the chance for collision is pretty high particularly if there is a sound call for each rotation of the spinner. We will see. There isa different side channel method I could use for the SmartDMD, so I could reconfigure that... the discovery of this cross-mech is making me want to try this even more. Marco has recently gotten the Pro plastics back in stock. I am going to order a set of those so I can undo this mod if I decide to sell the MET in the future and return the game back to normal state.
And I'm late to the game... the Grave Marker kit is sold out on Marco's site.