Dear Scott, thank you.
It's clear that I misread or I didn't fully understand the ANSI correctly since I thought that once the responder was muted it shouldn't respond until it was unmuted with the proper command...
Big mistake.
Now the discovery make more sense
Regarding the Goddard I'm quite sure that it send a RESET_DEVICE when in the RDM discovery menu you choose to mute a specific device.
Anyway this will not be a problem any-more since it should be solved as soon I fix the discovery.
Again thank you.