@daveyf - Right again, Davey (and @soix ); I don't know why he couldn't have put a 'Mute' button on there - all I really require is volume and mute.
@oliver_reid - I have Marten Parker Duos - they deliver that in spades; they do with my current preamp.
@signaforce - if I go the PS Audio route, it would be to audition the new PMG Signature preamp.
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I've researched all the suggestions you all have made, thank you, and as of right now, I'm leaning towards a home audition of a Backert Rhumba Extreme 1.4 and/or an LTA MicroZOTL Level 3.