You still have not clarified what your ultimate goal was ??? Two decoders on one address ?? Both decoders showing in the same Roster entry and not having to open
two definition/roster entries to program ?
Since the shared CV's must be on the same value and all others are not shared, it makes no difference that I can see.
The SFX series and particularly the SFX04 (and SFX06 that replaced it) Soundbug was designed to? be used with the DH165xx series of Digitrax decoders.
Marc