I have been using Sonar 6.2.1 just fine now for about 4 years now.  Nothing in my system setup, hardware or software has changed recently.  For an audio interface, I am using Sonar Power Studio (SPS-66).
 
Then this morning when I launched Sonar, for some unknown reason, I get this error message:
 
Audio Driver Error.  The following driver(s) either do not support the correct audio format or are in use by another application.  Please choose whether you want to disable them or use them anyway:  SPS-661, SPS662, SPS-663.
 
I get no sound, even if I select “use them anyway.”  These drivers which I downloaded from Sonar were installed years ago and worked just fine up to now.  If I restart my computer, same problem. 
 
What happened?  If I need to re-install drivers, what steps do I take (not even sure if Cakewalk supports these old drivers)?  Thanks, I’d like to get recording again.
 
Greg

wat operating system are you using?  which driver mode?  not sure why it would have happened suddenly but it's possible if you're using WDM driver mode that sonar reverted to your onboard soundcard for the PLAYBACK or RECORDING TIMING MASTER in the OPTIONS>AUDIO window.  check those and make sure only the SPS is listed.  also make sure only the analog ones are listed unless you're using SPDIF - but sometimes SPDIF gets selected.

Thanks Beagle.  I am using Vista Ultimate.  I checked under Options > Audio for PLAYBACK and RECORDING TIMING MASTER and it shows SPS-66 1, which I believe is what it has always shown.  Not sure what you mean by making sure "analog ones are listd."  I am not familiarwith SFDIF and don't see it selected anywhere.

I downloaded the SPS-66 drivers from Cakewalk (for Vista 32-bit), but I am wondering if I should uninstall and reinstall drivers first or try a System Restore, selecting a point in time a few days ago when the drivers worked fine.  Opinions?  Thanks.

Greg

sorry - actually the SPS66 doesn't have SPDIF, but it has "digital" which I assume means ADAT or similar.  just make sure your playback and recording masters are the 1/2 inputs and outputs instead of something that says "digital" or ADAT or "optical"

WRT drivers and MS update:  you can try that, I'm not sure if that will help or not.

you might want to try a different firewire port.  it's possible that this one is losing power intermittently causing an unload/reload of the drivers when windows "loses" it and finds it again.

Beagle, the inputs and outputs are correct.  I did an MS update.  Not familiar with WRT drivers.  I only have one firewire port on my computer.

I had been going back and forth disabling my computer's sound card to be able to use the 32 bit depth on my SPS66 (sound card), but that has never caused a problem in the past.  Regardless of whether my computer's internal sound card is enabled or disabled, it makes no difference.

I don't follow what you mean about the onboard soundcard - what does that have to do with 32bit depth on the SPS?

You do not record at 32bit. Its impossible to recrd at 32bit. So
disable your onboard sound chip and dont set your reocirdng bit rate to 32bit. Set it to 24
32bit is for floating point only, not fixed pont..

Problem fixed!  I decided to simply download and re-install the SPS-66 drivers and I got sound.

Sorry, I did not mean recording at 32 bit.  I really meant I disabled computer's internal sound card and in Sonar I set the Audio Driver Bit Depth to 24. 

Thanks Beagle and CJaysMusic for your efforts to assist me.  Without folks like you on the Forum, I would have been dead in the water years ago! 

Greg

>> Its impossible to recrd at 32bit.

Is this really the case?  
If one's soundcard is limited to 24 bits and one selects "32 bits" within Sonar, then the program may actually be writing out 32-bit WAVs -- but is probably filling out the higher-order bits in each 32-bit word with zeroes.    (Just a guess--I could be dead wrong!).   But if this interpretation is correct, then technically one is recording at 32 bit -- although only 24 bits in each word are significant.

zgraf - you are correct.  dave was referring to the actual 24bit recording of the hardware.  sonar adds the extra bits in software.