Another week, another problem. I wish there was just 1 week where i could use my soft and hardware without troubles... Anyway, my latest: When i start Sonar now i suddenly get a really annoying loud non stop beep. As with most of my problems this started out of nowhere...no cables changed, no hardware, no software. One day to the other this started happening. Any suggestions? Thanks.

Did you add any plug-ins recently, like a demo plug-in? If not, then you should run a full anti-virus scan. 

Is it coming from the OctaCapture? Does it happen with the OctaCapture unplugged?

No new plugins. No new added software. It only happens when i start Sonar. No clue if it's the octa capture itself or the software. I do know that i only happens when Sonar is running.

try bypassing all fx and see if it goes away. the button is on the control bar.

Ok, if i run the stand alone Guitar Rig software it also happens. So as soon as something triggers my octa capture this happens. I reinstalled the drivers. Didn't change anything.

That's the audio engine, Does it go away when you disable it? 

First, use headphones to trouble shoot to rule out bad connections elsewhere. 
Start from the beginning , Computer off. 
Listen to the Octa capture from the headphone jack. You probably will hear nothing there with the computer turned off. 
Turn on the computer and play a song with Windows Media or Win Amp. 
Open another DAW and listen. 
Then open Sonar. 

I had this exact problem with a M Audio Fast Track Pro. 
It was in the A/D converters or something. 
So I ended up using the SPDIF and it was dead quiet. 

sounds like gr thinks it is not properly licensed.

go into windows device manager and disable built in sound card and any aftermarket video card if you installed one. report back. might have been automatic update in background.

Didn't see your second post as I was typing same time.

So that points to it sourcing from the audio engine and possible bad A/D converters. Is it under warranty? 

Make sure you are not getting some sort of internal feedback loop from internal monitoring capabilities on your sound card.

I was getting a similar problem occasionally and when I turned off the monitoring on my Dakota card, it stopped.