Pro Channel EQ - Causing Glitches

Ok this is annoying! Some of you may have noticed in another recent post that I mentioned I avoid my Pro Channel because its CPU intensive. I was then shocked by how many people have absolutely no issues with theirs - so why is mine so bad?? I have a powerful PC - 64 bit, Windows 7. I believe the issue is on the EQ only. When I sweep frequencies, play back glitches and 'motorboats' for a second or two and then commences. I literally can't use the EQ because of it. I am not running the signal through any other plug ins, no busses, nothing on the master. It's driving me crazy because the Pro Channel is one of the biggest reasons I upgraded to Sonar X2. Sonitus EQ works absolutely fine. Does anyone have any ideas? Please let me know if you need more information. Many thanks, Dave

Do you have X2a?

yes i have the update. 
sorry, BJ, sample rate is 44100 and buffer size is 384. 

have you tried playing with your buffers ?
its got to be soundcard related.
ive never even heard of such a thing with the pro channel.(not to say this is all in your head,i know its not)
but this is something to do with your sample rate or buffers in que.
or something with the m audio card.

Ok - this is odd. I changed my soundcard buffer size to 512 samples. Then I booted up Sonar and played around with the EQ and it now works like a dream. However, thinking that it was the buffer size that had been the problem, I looked again and noticed that the buffer size is actually still reading as 384. It hadn't changed for some reason. Whaaa?? I have a nasty feeling that this will be an intermittent problem. Does anyone know what might be going on?

Hi John, yes I have ASIO selected in my preferences. I'm using an M Audio Audiophile 192 sound card. Could it be that I have an incorrect setting elsewhere in my Sonar preferences? Let me know if you need more info. Thanks

Thanks John.

I was able to run Sonar X1 a few years back, Pro Channel didn't glitch on that system, some drum software was a little intense, when the synth was opened, on that computer, so I would shut down sonar goto the M audio and tweak between 384 samples or 512, this was a Eco dual core that I purchased during a rough patch, same card Audiophile 2496

Then when I purchased a 64 bit win 7 for my Sonar, I installed my trusty Audiophile card, all seemed okay at first, but once I went through the process of installing all my softsynths, I was disappointed that I had to resort to 512 or higher for glitch free playback.....

Of course I tried DPC latency checker, it indicated that my new system had resources that resulted spiking as indicated by that software .....But What?

So yeah I tried suggestions of win 7 tweaks recommended from various sites....no cure

One day I decided to go to system configuration and turned off all services then reboot....my computer looked like win XP Sonar launched and I was able to crank down the ASIO to 64 samples and the new system worked like a charm

Downside....no I tunes....internet.....media player,,,,yikes,,,,,so I started guessing what services I would need but didn't make much headway.... I turned all the services back on a presto Sonar was able to work fine on 64 samples

What I learned from this forum is most members have different issues with their system, there is not a common denominator to disappointing performance