It turns out that 92.3 AMP was way "Too Good at Goodbyes" (pun intended) when it flipped to ALT, although I have to say that was a smart move for Entercom, and could allow them to tweak the HD2 channel into a more active rock direction. Although my biggest worry was that iHeartMedia was going to beat Entercom to the punch with their registration of the alt104.com and alt1043.com domains.
I guarantee you, unless the HD2 is being used to feed a translator or is just flat out being leased, nobody in America puts any thought and effort into their HD side channels. None whatsoever. They have no measurable audience and make no money.