My ears are ringing from blast of white noise from Logic 9

Actually messing between a firewire interface (SafireLE) and a USB interface and the firewire still glitches with guitar input. no problem with the USB interface but i think it is due to the software i am using because FW plays back recorded music great. Not helping much just adding some information.

radman wrote:
Thanks so much for your response!!
The Zed R16 is a firewire a/d built in mixer
It does have its own driver.
It seems weird sometime a whole minuet will
go by before the next occurrence of noise.
It is not a level issue since it occurs on all tracts.
Could a firewire problem be intermittent like that?

Since it happens on all tracks... it almost has to be the Firewire
connection/communication. Since it uses a custom driver I would be in immediate contact with them to see how many others have reported the problem, if they're like other companies, they keep a database of computer hardware combinations and possible problems. Are there older drivers you can try, are new ones planned soon?

pancenter-

Also, try unhooking the external Seagate drive and run a 16 channel test recording using your internal drive. You're probably saturating the Firewire bus.

pancenter-

I had this happen as well, I thought it was from my Apogee Ensemble interface. It actually happens every now and then. I was ready to dump the Apogee.

This is a very serious problem and I hope Apple will address it in the next update. Yesterday it happened unexpectedly four times to me during a session with a number of musicians on headphones. Luckily their monitoring levels were low. Mine were not, however. As much as I like Logic, I will be driven to jump over to another DAW if this is not fixed.

I think it is not wise to insert or move an active plugin while a DAW is playing.
I cannot provide any digital insights as to why you shouldn't do this, it just feels like something that might be unhealthy.
It may be somewhat analog to this: you don't plug in an unconnected cable to an amplifier - you know to plug in the guitar (or whatever instrument) first. Switching plugins while playing feels like replugging an electrical instrument while playing live - you only do that when the signal is turned to -∞, and it is only turned to -∞ when there is no part to play...

Eriksimon wrote:
I think it is not wise to insert or move an active plugin while a DAW is playing.
I cannot provide any digital insights as to why you shouldn't do this, it just feels like something that might be unhealthy.
It may be somewhat analog to this: you don't plug in an unconnected cable to an amplifier - you know to plug in the guitar (or whatever instrument) first. Switching plugins while playing feels like replugging an electrical instrument while playing live - you only do that when the signal is turned to -∞, and it is only turned to -∞ when there is no part to play...

The last update has now come through APPLE SOFTWARE UPDATE

http://www.macrumors.com/2010/03/02/apple-releases-prokit-5-1-for-leopard/

This ProKit Update fixes issues with user interface software resources that are shared by Apple's professional applications.

The issues addressed include:
- Corrected an issue with improper scrolling behavior.
- Resolved memory leaks for improved performance.
- Addressed layout of interface elements in certain application alert windows.

The update is recommended for all users of Final Cut Studio, Final Cut Pro, Motion, Soundtrack Pro, DVD Studio Pro, Aperture, Final Cut Express, Soundtrack, Logic Pro and Logic Express.

Add me to the list, was occasional on 10.5.8 and 8.02.Now its worse since upgrading to 10.6.2 still 8.02.Tried a no external plug ins and still got it.This NEEDS serious attention.

Have you experienced blasts of white noise while using Logic to record or play back audio?
• Yes

Under what conditions has the noise occured?
c) both

After recording audio, has the waveform overview ever looked normal but playback resulted in white noise?
• Yes

After recording audio, has the waveform overview ever appeared like a thick solid white bar that filled the entire waveform display (peak-to-peak waveform level)?
• No

Computer -- complete specs of your Mac, including:
• 2.4 Ghz "Santa Rosa" MBP w/ 4 GB ram

OS
• version # 10.5.8 , as of today 10.6.2

Logic
• 8.02

Frequency
• Quite often, more so on 10.6.2

Audio Interface
• Presonus Inspire 1394
• connection type FW
• Tested "built-in audio" as well.same issue

Hard Drives -- list each audio drive which you've used in the course of production and from which audio recording or playback has resulted in a white noise blast. Leave this part blank if you don't experience the white noise problem.
• Make/model, capacity
• Type: internal -FUJITSU MHW2160BHPL
• Interface (FW400, FW800, eSATA, SATA, etc.) SATA
• Is this your system drive? Yes
• Journaling: On, system Drive only
• if using a FW or eSATA drive, is the drive daisy-chained to any other devices? If so, describe the chain...

Using OWC FW case with WD HD(ide) 80 GB 8 mb cache.Also tested Lacie 1394 Disk drive 160 GB.

Add'l Info and Observations:

Have tried Presonus on seperate FW express card w/ HD on internal bus and vice versa.Remove all plugins and tried to no avail.

Does it also happen when you deactivate Sudden Motion Sensor?
http://support.apple.com/kb/HT1934

That article only applies to portables. Not relevant since this issue affects pretty much every Apple machine.

At this time, it is not clear what can cause this. Maybe there are multiple reasons.
But recording on an internal boot drive on a macbook with SMS activated in a loud environment like a rehearsal room, it may happen when the disk spins down and Logic has no place to write to.
I simply would give it a try.
Also I would strongly suggest to use an external drive, 128 buffer and deactivate as much plugins as possible or use any other monitoring instead of software monitoring if it's not working.

You might want to read through the whole thread. Many people are experiencing this on desktop systems and most are using dedicated audio drives. Deactivating plugins, changing buffer size and disabling software monitoring also doesn't stop the issue from happening. What IS known at this point is that this issue is indeed something Apple needs to address.

Get Softwareupdate.
Logic 9.1.1 is out.

Addresses 64 bit issues, long file names and EXS mapping. No mention of this issue. I'll wager that if a fix ever does come, it will be in the form of an OS update.