OMG, what a waste of time!  Please disregard the above.  If I had permissions to edit posts I delete everything related to the HiFiBerry DACs above... The reason my HiFiBerry DACs seemed like they should be working but weren't -- as everything on the digital side was working both in software (alsa, aplay, pactl list, etc) and in hardware (as the green activity light was coming on) -- was that the analog section / output buffer failed!  On both of my HiFiBerry DAC2 Pros that I have!   I
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