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Glitches in audio mixdown files (Nuendo)

david pick

New Member
Hi, this is my first post in this forum. I run a UAD in a G5 2.5DP, with Nuendo 2.2.0.35 and MOTU 424 hardware. I do this stuff for a living.

Of course this may not be UAD related at all, in which case, sorry about the bandwidth, but with the Nuendo User forum down (4 days now) I'm flying a kite here.

Since changing from G4DP (which was very good with UAD, but too slow) to G5, I have started finding occasional glitches in audio mixdown files. I never get glitches during playback. The glitches are different from the ones many of us used to get with Nuendo before the bug was fixed with N2.2.0.35.

Has anyone else had this?

thanks
 

MPC

Active Member
I have a similar setup. I don't get glitches (at least with the Export audio functions) and I don't check the \"realtime\" option. Hmmm....sounds strange....the only difference is I'm using 2 UAD + PoCo in a Magma chassis. Could be a clocking issue. You know about how Nuendo has the nasty habit of resetting the clock to something you may not want it to (in my case it always resets to the \"video\" option.)? Are you resetting the clock in the PCI 424 console AFTER every time you open a N2 project? Perhaps you already know about that?
 

david pick

New Member
Thanks for the replies.

I didn't think I got these sorts of things either, until it happened. There was a similar problem for some people (not everyone got it, which is why it took Steinberg a very long time to fix) but nothing since 2.2.0.35.

This new problem only started since getting the new 2.5G5 DP.

I'm well aware of the MOTU clocking issues - mine works OK as long as I stick with Internal (both in the MOTU console and in N2). And I never seem to get glitches in ordinary playback, or record. Just rendering mixes.

Thing is, the glitches are quite quiet, and rare (8 or 9 in total spread across 16 songs). The songs were soft and had little drums, so I'm now wondering if it's happening quite routinely, but is masked by the style of music I usually record.

I'll try exporting using the internal soundcard, and if that doesn't isolate the thing, I'll pull the UAD card for a while. Trouble is (as with all intermittent faults) it takes ages to nail it because each change you make might or might not be having an effect.

I haven't tried Real time export. I would expect that to be more demanding of the system, and more prone to system glitches than an offline process, but I could give it a try.

I'll also try repairing perms, reinstalling, and trashing prefs , for luck

Oh well..Thanks again.

PS MPC - how is the Magma with 2 UAD's and a PoCo? Do you still get instability if you run the UAD's too hard with G5?
 

akisd28

Member
david pick said:
I haven't tried Real time export. I would expect that to be more demanding of the system, and more prone to system glitches than an offline process, but I could give it a try.
I thought it was quite the opposite.
 

Protone

Member
Hi David!

I have these glitches too in Logic6, but only when bouncing offline, and only when I have UAD-1 plug-ins in my mix. So trying real time export might be a good idea.
 

MPC

Active Member
I got all sorts of problems when I first got my D 2.5. Most of them not audio related. You may try defragging (long shot) your audio drive, and make sure it's NOT formatted as \"journalled\". I'm assuming you've got a 2nd drive for audio though. That may help. The non journaled thing really does help with audio performance.

Magma is stable. I get a bit more performance (maybe 10% to 15% more) compared to the UAD's being just in computer. Because of the limited card slots it's impossible to compare it with PoCo in the box. But, all seems to be going well. I've done about 50 or so audio tracks projects with a good amount of native plugs and the UAD's run to about 85% or 90% with not problem. After that I get click/pops/stuttering.

Your export problem has me a bit stumped though? I've done about four or five CD's worth of work with the new setup and I or any clients haven't noticed anything similar. You might have to try reinstalling EVERYTHING. Get a fresh start.

I have my suspicions about the new G5 D 2.5's quality control. I've had this G5 for a couple of months now and 2 computers and 2 video cards later, plus really going out of my way to setup and optimize OS X for audio use, things are actually working well.
 

david pick

New Member
Thanks for these useful replies.

Part of the reason for presuming that real time export might be more prone to errors is just that offline, if the system has a need for cpu cycles, the render can wait, but realtime, presumably there's a buffer running, which could under-run (probably rubbish...)

MPC, I've been pleased with my G5 apart from this issue, and the poor performance with UAD. The computer is a lot more stable than was my old G4 Quicksilver. Sounds like you had some bad luck. I may try reinstalling everything, but I'm extremely busy and it's a good 1/2 day to do that.

Meanwhile I'm trying some exports with the internal soundcard, and Bullmoon suggested reimporting, flipping the phase, exporting that against the mix and looking for glitches in the nulled file.

Apart from the UAD, I suspect the MOTU card/driver. i may get a digiface anyway soon.

best

david
 

MPC

Active Member
Trying with the internal audio may be a good test. If you do try trashing prefs. don't forget the MOTU 424 prefs, perhaps you already did that. I had problems with Waves plugins that were cured by trashing the MOTU prefs a while back. Bad RAM may also be a culprit. Try pulling all but the original RAM that the computer came with. I had that cause problems with \"bounce to disk\" in Digital Performer when I used to have a Quicksilver.
 

Pier NYC

New Member
The Nuendo forum isn't down, just the user forum has had problems (although it's been ok the last few days) but the hardware forum has been fine all along which is really the best place for this question.

Do you have gitches when you aren't using any UAD plug-ins?

My first suspicion would be the MOTU driver. MOTU is notorious for problems just like this. Try running Nuendo on the \"Built In\" driver and see if you still get glitches.

Pier, NYC
 

david pick

New Member
Thanks for all these replies.

I've just been too busy to get back on this one. I haven't had any more glitches, but this may be just good luck (they were quite rare.)

I ordered a Digiface, and I'm hoping that will fix this, and other known MOTU issues.

I'll resurrect this thread if I dsiscover anything interesting...

thanks again
 
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