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MOTU 828 transfers via ADAT- popping out of sync
Wed, 01/14/2004 - 22:02
i was doing some digital transferring from adat to my computer (audio desk)
via adat optical. just a basic transfer. first time i had actually done it.
everything was synced and working fine, but occasionally audio desk would
stop recording. it would just pop out of record. any ideas? could this just
be a processor performance thing and i need to assign more memory? i read
that when you first install audio desk in os X it optimizes your memory
allocation for best performance, but...
im syncing by using the smpte out of the datasync. i am not using the adat
sync because the 828 doesn't have an adat sync out and i needed the time
code to to get back to the data sync so i could send it to the panasonic da7
mixer. there is a smpte out on the datasync so i used it and it seemed to
work fine. sample accurate and lock up was good. except for the whole
popping out of record thing. but not sure if that's a hardware or software
anyway, thanks a lot!
Wed, 01/14/2004 - 22:10#1
Perhaps there's a threshold of allowable SMPTE drift that it sometimes crosses? ADAT sync is much more stable- you should use that instead of SMPTE if possible. It's worth the trouble.
I'm not as familiar with Audio Desk (I use DP) so I don't know its sync features (I thought it didn't have any). See if there is a tolerance for SMPTE drift that can be increased in number of frames. Does it happen at the same place each time? Then there might be a drop-out at that point on the master, or check that the frame rates are all the same and there's no pull-up or pull-down.
Since the 828 does have ADAT sync in (but not out), and timecode out, maybe you could make the 828 the slave and then spit out TC from the 828 to the DA7. Hmmmm...
re. memory optimization, In OS X there is no user-adjustable memory allocation- it's all automatic.
Wed, 01/14/2004 - 22:15#3
And don't forget that the 828 has MIDI out too, maybe it could send MTC...