Kudos to customer support. The engineer I was transferred to did not treat me like an idiot, did not read from a script, and came up with a final diagnostic trick which I have yet to try (I have already swapped cords, replaced the Remote Audio Adapter, tried the whole setup in my car, and moved the wiring physically as far away from interference sources as possible). He suggested powering the setup from another 12v source independent of the bike to determine if the problem is radiated interference or is coming right in through the bike's 12v system.
He said V puts a 1 microfarad cap across the +/- feed in the hardwire adapter, which should catch stuff like alternator whine, but this test should help isolate the source a bit more.
He also said that if garbage is getting into the muting data circuit it can cause behavior such as I describe, but won't hurt anything else, including V1 sensitivity.
What a nice contrast to most customer service calls I've endured in recent years.
-dan
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