Steven wrote:

HD/IBOC does not employ AAC, although an earlier
version may have IIRC. It uses something called PAC(?)


You have it backwards. It used to be PAC, derived from MP3.

Early testing showed it didn't work very well, so the codec was
switched to MPEG4 AAC+SBR.


One annoying thing I always found about either XM or Sirius
was even with a satellite dish the sets at Wal-Mart broke
up on and off as you moved around them. How QUAINT.

Huh. I thought the "backup" terrestrial stations were supposed to
prevent that. (shrug). When I was last at Walmart I tried to listen
to an XM radio, but they didn't have any operational. Nice. Way to
demo the system.