Old 02-16-2013, 03:36 PM   #1
AnyOtherCity
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Default Aggregate device crackling on one device

I've set up an aggregate device with an Apogee One and Emu Tracker Pre. It works perfectly for a while but eventually the tracks from the Emu start crackling, and it gets worse and worse, becoming a horrible distortion so it's unusable.

Anyone encountered this with aggregate devices?
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Old 02-16-2013, 04:30 PM   #2
mrelwood
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In the Aggregate Device settings I would check that you have a proper source for the clock source. Perhaps change the source to the other device, perhaps it would work better.
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Old 02-17-2013, 09:44 AM   #3
AnyOtherCity
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Have tried the clock source from both, but either way it just results in the Emu crackling after about an hour (not an hour of continuous recording, but an hour of use). It works completely fine on its own. Have also tried it with 'resample from this device' ticked and unticked, but still the same. I'm stumped!
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Old 02-17-2013, 11:15 AM   #4
serr
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It sounds like one device is clearly losing sync.

How are you clocking these devices? It's general practice to clock all devices with word clock (as opposed to getting sync from an audio connection like AES-EBU or SPDIF or from the firewire bus).

Have you designated your master interface and are you then clocking the other interface from it? (Master interface word clock out to all other interfaces' word clock in.)
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Old 02-17-2013, 02:11 PM   #5
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Are you using L or ML? I'm getting the impression that they broke some aggregate device functionality and also sync. E.g.

https://discussions.apple.com/thread...art=0&tstart=0

https://discussions.apple.com/thread...art=0&tstart=0

Opposite experience:

http://www.gearslutz.com/board/music...te-device.html

However, AFAIK even with Slow Leopard the aggregate device didn't always work with all interfaces.
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Old 02-18-2013, 03:32 AM   #6
AnyOtherCity
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Ollie: I'm using Lion (too scared to upgrade at this stage!) The issue of mixing different manufacturers could be part of it though. Obviously the One is designed for OSX but the Emu very much isn't (they only released drivers for Lion about a year ago).

Serr: I understand about 10% of what you're saying but I will do some research as that sounds plausible. In aggregate device settings I'd just set one interface as 'Clock Source' - but either way the crackling starts after a while. From what you say it sounds like there is a more complicated procedure that I need to dig into.

Thanks for the input guys
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