Hi all,
 
I am using x3 and m-audio fastrack pro; behringer mixing board; samson servo 180 amp.
 
I have a pesky buzz I cannot get rid of that is finding its way into my audio mixdown.  
 
I tried unplugging the synth output from the m audio mic/instrument inputs but buzz persisted.  I unplugged the m audio output and that killed the buzz.  As outputs from the m-audio I'm using Balanced Outputs 1 and 2 (TRS Outputs 1/2) – These are balanced 1⁄4” TRS jacks. 
 
Is it therefore definitely the m-audio?  I think the mixing board is not the problem as there is no buzz if, for example, I run the synth directly through the board and not via the m-audio.
 
I also tried moving the m audio thinking that something it was near was causing a problem.  No dice.  
 
The M-audio draws its power via the USB connection to the computer, so plugging it into another outlet is irrelevant.
 
I played with the Gain knobs on the M-audio to no avail.
 
Any thoughts?
 
Thanks
Eric

Hi. Here is maybe a good read for you, provided you have not already read it.
http://www.native-instrum...ng-and-buzzing-sounds/

Somehow I answered for a wrong thread here. Sorry.

Can you please detail your settings for the audio interface and for Sonar?
 
Driver Mode in Sonar Edit>Preferences>Audio>Playback and Recording (try ASIO)
Sample Rate and reported latency values in Sonar in Edit>Preferences>Audio>Driver Settings 
Record Bit Depth in Edit>Preferences>File>Audio Data
Sample Rate from audio interface
 
Also just curious - what kind of synth are you plugging into the audio interface?
 
Bob Bone
 

Could be a ground loop, or an input that's accidentally open.

If it sounds like 60 Cycle hum, you could be running a cable along an AC power cable. Avoid parallel runs of audio cable and power cable, all cords must cross at 90 degree angles. Another possibility is the lighting you have in your studio, rotate your M-Audio box 90 degrees when you hear the hum and see if it changes for better or worse. Check the proximity of the box to your computer, add some distance to see if that improves it as well. The processor makes lots of noise and could easily be the source.
 
Report back!
 

It's interesting how sometimes what seems like a technical challenge can turn out to be a bad cable or a grounding issue.  Other times it can be actually a technical issue of course.

Have you tried running the maudio interface with the external power supply plugged in?

This solved a high pitched whine I was getting from my Maudio Fast Track Ultra