Hi everyone!
I'm in the process of transferring a bunch of songs from 2" 24
track tape to ProTools. I'm doing each song in two 12-channel passes
with ProTools chasing SMPTE on the unresolved 2" tape using a Universal
Slave Driver. In transferring the first song I was surprised to see
that the second 12 channel pass had drifted 49 samples off from the
first pass.
There were actually less than 24 total tracks, so I recorded the
kick drum track with both passes to ProTools in order to verify sync.
At the top of the song the two kick tracks in PT were 3 samples off
each other, but by the end they were 49 samples off.
I have the USD set to Internal/VSO for Clock Reference, LTC for
Positional Reference, with the correct Frame Rate and the USD solidly
locked to the SMPTE. Although musically 49 samples is close enough,
this still strikes me as strange. Could it be because I'm unresolved
to any type of House Black? I'd still expect sample accuracy since PT
is locked to the SMPTE on the source. Or should I perhaps set the
USD's Clock Reference to "LTC"? It didn't seem to want to lock that
way, probably because the 2" machine is unresolved.
Any insights? Am I doing something wrong or is this as close as
it's going to get, unresolved? I can't get my head around why Lack Of
Black would make a difference, although I suspect that's what the
problems is.
Thanks, Rick.