Massive problem with audio interface

http://goo.gl/zYwcMm

This will fix it for you!

Legend, cheers - shall give it a whirl.

One more to the list.

I have a late 2013 21" iMac, 3,1 GHz i7, 16 GB RAM, 1TB fusion drive with a MOTU Ultralite Mk3 Hybrid (connected via the Thunderbolt to Firewire adapter).

I was running OS X 10.9.1, and I was having audio drop outs after 3 to 5 seconds, or sometimes even no audio at all. I had tried with several other audio interfaces (AVID MBOX 3, FOCUSRITE SCARLETT 6i6) and they didn't work either. All of these worked fine both on my PC laptop and on an old 2008 iMac running Snow Leopard.

I downloaded the OS X 10.9.2 Beta Version that you posted here and now it seems to work much better, but I still seem to get some glitches and occasional drop-outs. It is somehow "acceptable" now, but not what I was expecting from an iMac whatsoever.

I posted my case to the feedback link, hope Apple work on this and they release a stable version of the MacOS X 10.9.2 that fixes completely and permanently the issue!

Thanks for all the contributors to this thread, it was really helpful!

Thanks Anthony the beta helped get a marginally more stable device.

There are still the same issue but they are much more infrequent. I have a MacBook Pro 15inch haswell with a Maudie fast track ultra which worked great with 10.9.0 it only broke with 10.9.1. It's half fixed with 10.9.2 beta

The beta is defo more buggy than the real releases though so beware guys.

Apple still haven't fixed the problem though. I still get buffer undefined clicks that have nothing to do with the buffer size but now ever 20-30 mins so useable but some takes are rubbished.

It's introduced a new error for my setup where the sound glitches and stalls then it slips in time to then have a huge latency. Fixed by switching buffer sizes but annoying still. This new bug only happens 1-2 hours but is kind repeatable using certain plugs for prolonged periods. I kinda wish they had left some of this stuff alone. Or at least detect the usb hardware and prevent the new code running which must be a change to save battery.

Who know when 10.9.2 will finally arrive but the current beta posted here is a fixed albeit a flaky one that will leave you feeling a little bit nervous about the fix being 100% done with official update.

With the beta update installed, you may not even be able to update to the final release of 10.9.2 and may need to do a full reinstall to run it.

Be careful with Beta OSX software if you don't know what you are doing.

Good luck

Pete

This is something I didn't know, and no I don't really know what I'm doing. I'm a songwriter who bought Logic Pro X and an Imac to basically help with a few projects, it's all kinda gone wrong since then.

Who else is using the beta here? And having success?

Is the combo the same as beta? I'm totally "non-tech head"

Any 10.9.2 release is a beta as Apple have not yet released the final update for the public.

Pete

"Not what I was expecting from an iMac whatsoever." Totally with you there, however, I blame focusrite also, there is very mixed information on their site. I'm a layman here so when I saw that they exclaimed apple and focusrite were compatible I thought "hey, great!" and that was good enough for me. What I didn't realise was the rest, the nitty gritty. Partly my fault mostly theirs I feel. Not everyone who buys their equipment, forking out a pretty penny for the gear will be experts in this. A lot of us are just starting out.

My understanding is you can upgrade a beta to a final release when it arrives.

I loaded beta, experienced no benefit with my Behringer UMC204, and reverted back to 10.9.1 via recovery drive no prob.

Perhaps this has been stated already but try recording to an external usb 3 hard drive or thunderbolt, you should not record audio to your system drive. My guess is that the fusion drive shuffles around the audio during playback between the two system drives tha tcreate the fusion drive and perhaps Mavericks has some a bug as well. But really its best to record the audio on its own drive.

Also turn off spotlight for your external audio drive by selecting it in the privacy tab in spotlight system prefs, then add your external drive by clicking the plus sign, this keeps spotlight from indexing the drive when recording new files you can alsways turn spotlight back on when not recording to index your new files. Also make sure app nap is selected tyour audio app from napping. I have pro tools 11.1 and it works fine on my setup but I have a mac pro with an ssd for a boot drive, not a fusion drive. I feel your pain, good luck.

Cheers for the link to beta, seems to have sorted everything out, no bother here now. To the guy using Behringer, EVERYTHING I've every owned by them barring a DI box has been utter gash, really.

Thanks a lot !!! 🙂
It works great now with the 10.9.2 !!! It resolves all the noise problem !
So happy to find that my iMac is not useless now !!

very interesting discussion, i bought new imac in december 2.7 hgz, 1T fusion drive and 16 RAM ... the system recognize my sound card (Presonus 22 VSL) but cannot deliver any sound, correction, i can barely hear something behind cracks which sounds like my voice ... i bought this imac and this card for recording purposes as long as a condensator mic ... i tried my good old Fast track inteface and it is almost the same so what i will do this week end is to bring back from the basement my 2007 imac and try the presonus

i read many things around forums :

explanation 1 : it could be because of the USB 3 (presonus is USB 2) ... i dont think that is accurate because i pluged and recorded with a Line 6 POD XT.

explanation 2 : the fusion drive thing .. well, i am not familiar with IT and systems but as long as i paid something more expansive i imagined this would be a robust and reliable option .. which is obviously not if confirmed

do you guys confim the fusion drive has to be splited (i have to go to an apple store to find out how the **** i can do that) ? or do you thing this Beta version of mavericks will solve this **** problem ?

i am very disapointed, like many of people around this forum i bought this expansive devices for sake of reliability and trust on a brand which is used a reference in recording stuff ... it seems i was all wrong