When I hit 'create new project' I get error message ''due to soundcard driver the project is 44.1 / 32 bit''.
That's not a Sonar issue I think.
Would anyone know if I can check a project file is 32 bit or 64 ? 
(Have only installed Sonar 64 bit, so would be suprised if projects still are 32 bit)
THANKS..

Projects are the same whether created on a 32bit or 64bit OS using 32bit or 64bit SONAR. The driver error has nothing to do wih the project but the audio devices and driver preferences in SONAR. Maybe the PC sound chip is enabled in SONAR devices along with the audio interface.

thanks, that's great to learn

You'll need to configure the audio device on your own, particularly if its external. The Win Control Panel should have the controls for the internal audio card. I've got some external switches on my external USB audio/midi interface for these. For Sonar, the 44K sample rate is in the Preferences/Driver Settings (along with the ASIO panel if needed). The Bit Depth is in Pref/File/Audio Data and appears to be a project/file setting. You might have your audio HW configured for 24b/48K video settings (?) while using a Sonar 16b/44 preferences SW settings. Check that they are in synch.
 
When I hear questions about 32/64b 'projects', I'm usually thinking about which VST sets are being used, not audio.

Be careful not to compare apples to oranges. There is 32-bit vs 64-bit operating system, there is _also_  32- vs 24- vs 16 audio file bit depth. Your original error quote looked like it might be squawking about the 32-bit depth of some audio setting, as in 32-is too, um, deep for that interface to handle? (CD audio, for example, is 16-bit. HD audio can be 24-bit.) Audio bit depth (4, 8, 16, 24, 32) is something else altogether from operating system native operand size (32-bit or 64-bit, or 8-bit if you are still running Cakewalk for Commodore-64). Either operating system style has ways of supporting all those audio bit styles.

thanks guys.
now spotted a weird thing on my Akai Eie soundcard, it flips back to displaying set as 44.1 constantly while Sonar project stays at the higher sample rate.
Minute ago it shows at 96 and now it's suddenly showing 44.1, Sonar stays at 96 though.
have the latest driver, no other soundcard active in Windows hardware....where I set it to 96/24.
something on my computer must tell it to use 44.1 all the time, can't be Sonar I guess as everything there is at 24 bit / 96......off to the Akai forum next....no prob 
 
 

Windows and system sounds used to drag audio settings down. Make sure your system sounds are disabled.