Logic Pro 9 Problem delayed tracks / Sync?


Hi there,

for a recording session I need 24 input-Tracks.

My configuration:
iMac 2,4 GHz / 4GB RAM
OSX 10.6.6
Logic 9.1.3
Focusrite LiquidMix32

MOTU 828 mkII
M-Audio Fast Track Ultra

I created a new audio-device called EPTotal in the audio-utility. The first device from EPTotal is the 828, the second one is the Fast Track Ultra. OSX makes the checkbox "Resample" = TRUE. In Logic I choose "EPTotal" in the audio-konfiguration.

8 Track from DI Mackie Desk to 828 Analog IN
8 Track from DI Mackie Desk to M-Audio Fast Track Ultra
8 Track from Yamaha 01V to 828 ADAT IN (optical) --> 828 is master / 01V is slave no wordclock/sync problem.

In Logic there are on all 24 Autio Tracks a signal. So far so good. On all channels of the Fast Track there are a larger latency. After recording, all tracks from the Fast Track are delayed about a half beat. But it various from take to take.

At first, I thought it was a sync-problem. So I deactivate the 8 ADAT channels. No result. I tried to set the "Resample" checkbox = FALSE in the audio-utility of OSX - no result.

Has anybody an idea, what the problem could be?

Lot of thanks.
Hi Jarguzzi,

Unfortunately you may not be able to fix this. I also have a Aggregate device made from a 828 and a M-Audio Profire Lightbridge. I also have a delay which is not stable - and I am recording only ONE stereo track !!

People say that with interfaces on firewire you may never get a stable delay if those devices are synced from another source, because each time you press record the buffer for the bus gets re-calculated. And really, each time I record it does slightly vary. Plus, the M-Audio drivers are really shitty.

I am thinking of buying a PCIe-card (i.e. from RME) to replace the Lightbridge...

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I have never had professional results from an aggregate device. It may technically function, but it's too quirky to rely on.
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