Hi, guys.  First off, I don't think this has anything to do with the other "buzz" or "hum" threads that I've read lately.  In short, the situation is that occasionally when we start the transport in Sonar X3c there is a loud, harsh buzz sound.  Sometimes it corrects itself after about a second or so.  Other times it just causes the audio engine to stop.  It happens more often when I start and stop the transport several times in a row.
 
I can perform the same operations in X1 without any issues whatsoever.  Same project, same DAW.
 
The project has about 100 tracks.  Most of them (a bit over 50%) are archived.  There are many effects and automation envelopes.  The system is an i7, 16 GB, a Lynx AES16e connected to a Lynx Aurora.  We have current firmware and drivers.  When the project is playing back, only about 15% of the CPU is being used, so it doesn't seem like a horsepower issue.
 
The problem of the audio engine stopping seemed to be reduced when we increased the "droupout timeout" value in the configuration.  But, it only helped a bit.
 
Any thoughts?  Thanks in advance!
 
Ed

Disable 64 bit Precision engine in preferences. Wait for X3D. Cheers.

Thanks for the reply.  I should have mentioned that I already tried that based on the comments in the other threads.  From what I can tell, this buzz (only when starting the transport and lasting about a second) is different from the other buzzes and hums I have read about.  Maybe I'm wrong and X3d will be the fix.
 
Again, thanks for the reply!
 
Ed

I used to get that buzz with the NI Pro 53 and various other DXi synths, it had something to do with the ASIO driver buffer on my system and not the 64 bit engine as mentioned above.
 

It sound like what some people here call "motorboating", or some such.
 
Try a search with that, or I'll have a look in the morrow.

Thanks for the replies, guys.  I am certainly familiar with motorboating and, in this case, it's something different. It's like somebody hits a buzzer button for a second when I start the transport.  The aspect of this that really puzzles me is the fact that it *never* did this in X1 - not even once.  I've been wondering if perhaps Sonar X3 behaves a little differently when the transport starts compared to X1.  e.g. does it have some initial reset or synchronization process with the driver when you start.  Perhaps that process is just different enough to make my Lynx AES16e card freak out a bit.
 
Ed

Hello Ed,
 
Yes! i experience the same thing. Sometimes the buzz/tone sounds like Morse code as the scrub bar moves along during playback. There is sometimes a similar noise when clicking in the the timeline to move the scrub bar to a different position on the timeline.
 
I am using a MOTU MicrobookII USB interface.
 
All the best,
 
Lee.

Lee please tell us that you disabled 64 bit precision engine (somebody has to ask the question). Thanks...
Otherwise this whiffs of a driver or maybe firmware that needs updating
http://forum.cakewalk.com/Driver-Boost-m2928792.aspx
 
Otherwise some latency issue.

Hi, Lee.  I'm curious, did you experience the buzzing in X2 or is it only in X3?  In my case, X1 continues to be fine and the buzz when starting the transport is pretty reproducible in X3c.  Just for grins, I've updated drivers and firmware (and disables the 64 bit engine) just to rule those out...
 
Ed

This happens to me when I open a project with a different sampling rate from the last project I loaded.