Ritek QuattroDrive - Manual (Page 18)

Using the OSD Setup Menus
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DUAL MONO – Can only be with Dolby Digital disks that have dual mono soft-
ware encoded in them. You can select one of the following options: STEREO, L-
MONO, R-MONO, or MIX-MONO.
DYNAMIC – Move the slider to make your selection.
PRO LOGIC – Set this as ON, OFF or AUTO.