As my Creative s750 Gigaworks 7.1 set has
A wired control pod with top-mounted power, volume-down,
volume-up, select, and upmix buttons.
Upmix toggles between three modes: off, 5.1 to 7.1, and 6.1 to 7.1
As my Verizon FIOS HD DVR set top box (Motorola_7232) only outputs 5.1
I could get an AVR Receiver that uses 5.1 and upmix to 7.1
My TV is a Samsung PDPTV 51″ Plasma
http://www.samsung.com/us/video/tvs/PN51D450A2DXZA
