Simon will probably best be able to guide you. Are you returning in the DUB packet the UID properly encoded? Not sure what Simon does when he gets to the bottom of the tree and can't decode the UID as to whether he tries to do a Mute anyway.
Have you tried using the discovery software with the Enttec or other controllers and been able to discover your responder?
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Scott M. Blair
RDM Protocol Forums Admin
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