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Mixed input sources - Digital mess!

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Mixed input sources - Digital mess!

Postby Down in the Cellar » Wed Nov 30, 2011 6:14 pm

Please Help!

I'm trying to record multiple instruments/voices through different pre amps to my MOTU 828mkII inputs:

1. One Focusrite Liquid Channel - AES output which I can connect to the SPDIF input, using a converted cable.
2. One Focusrite Voicemaster Pro - Balanced analogue output, connected to balanced analogue line input. And
3. Eight Focusrite OctoPre le - ADAT output, connected to ADAT in.

Recording from any of these sources individually and setting my MAC's Audio/Midi Clock Source to either:

1. SPDIF
2. Internal
3. ADAT Optical

...gives me perfect results - However, trying to record them all using ANY of these sources won't give me recordings without digital spikes.

So, what do I do?

I feel that the secret is hidden in Wordclock; I have connected the two digital units to the 828 using Wordclock but I can't get it working. This is beating me!!!!

Thanks

Rob
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Re: Mixed input sources - Digital mess!

Postby Hugh Robjohns » Wed Nov 30, 2011 6:54 pm

All the digital bits have to be running at the same rate and producing samples at the same time. If not, you get splats and clicks as you've found.

The solution is to make one device the clock master, and the others must be slaves. I would suggest making the octopre the master, so set that to run on it's internal clock and output adat to the motu which should be set to clock from that adat input as a slave.

Next, run a word clock cable from the octopre clock out to the liquid channel clock in. Set the LC to clock from the word clock input. Connect the aes out from the LC to the motu.

It should now work...

Hugh
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Re: Mixed input sources - Digital mess!

Postby Down in the Cellar » Thu Dec 01, 2011 9:21 am

Hi Hugh

This is what I needed to know; A straight 'Do It Like This'.

All works well now.

Thank you.

Rob
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Re: Mixed input sources - Digital mess!

Postby Hugh Robjohns » Thu Dec 01, 2011 9:30 am

Fab. ;)

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Re: Mixed input sources - Digital mess!

Postby Zukan » Thu Dec 01, 2011 10:08 am

Rob, we have a dedicated but small shrine round the back here in the forums dedicated to the phenomena known as 'The Hugh'.
We are currently selling 'THR' (The Hugh Rosarie) which can be bought from all good leading retail outlets.. We can, of course, arrange one to be sent to you for a nominal sum and it will be 'touched' by The Hugh and therefore quite a collectible, and of course, if you have Firewire it will now work irrespective of drivers etc..

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Re: Mixed input sources - Digital mess!

Postby ConcertinaChap » Thu Dec 01, 2011 10:46 am

Me want me want me want it NOW!!!
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Re: Mixed input sources - Digital mess!

Postby Zukan » Thu Dec 01, 2011 12:08 pm

Please bear in mind that this is a limited edition:

THR

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Re: Mixed input sources - Digital mess!

Postby Martin Walker » Thu Dec 01, 2011 1:41 pm

:bouncy:
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Re: Mixed input sources - Digital mess!

Postby ConcertinaChap » Thu Dec 01, 2011 2:09 pm

Thanks, my electronic cheque is in the post.

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