And not a moment too soon!
WTF is up with the audio on 505? Atrocious! Muddled, dynamically compressed and sounds like they're running it thru some kind of cheap sound "expander" a la you're legacy TV's 2ch "simulated surround" mode.
I ended up watching the duration of the Celtics/Lakers game on 509. Whatever is causing this ailment seems isolated to WCVB-DT's local broadcast as both the audio on ESPN2 (prior to switchback) and thankfully WMUR-DT were completely unaffected and sounded "normal".
Lucky for me, I guess I hadn't realized 509 wasn't even carried until several days ago!
Hope it doesn't continue or might have to switch the Tivo to record using 509 instead of 505.