The DD740 allows audio delay in 1 ms (or 1/3 ms in fine mode) steps via its IR Remote control while you are watching for perfect lip-sync. It accepts four ( 2 coax digital and 2 Toslink optical) inputs and provides one of each outputs in any s/pdif format (including Dolby Digital 5.1). Turn ALL other audio delays OFF and use the DD740 to even correct for some arriving audio delay.
Felston DD740 Four Input Digital Audio Delay for Lip-Sync Correction
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