Thank you, All, for your advices.
Unfortunately, provided drivers for my card works best in ASIO and switching to any other mode brings some problems or unacceptable latency.
To be fair to card it was much better for XP (but still best in ASIO) with great provided mixer to control its I/O but after migrating to Win 7 drivers are not quite as expected and mixer is gone. Another thing, new approach for audio in 7 is a really trash. User hostile concept.
You encourage me for replacing my hardware and probably you're right. However, it is quite hard decision for me because I like very much external IO panel of the card and it has its also role in home entertainment and fits great in that. I am also not fan of instant recabling to use something as secondary audio connected on demand. Things are also little bit complicated because I am constantly moving between 2 cities where have different hardware but always taking with myself portable audio interface is not an option for me. Small luggage is my friend.
Well, I have things to consider...
In fact I have old but quite good audio interface with firewire port (ironically I have no firewire in my home computer but IO panel of audigy2 has one for connecting firewire devices) but it is rare used because of need to disassembly and reassembly. It needs 12W power supply I have concern if I connect it only by bus it wouldn't damage firewire in IO panel when getting too much power. But I don't want to make you bored. My English is poor and it is hard to explain all aspects.
But thank you again for your advices. I feel obligated to rethink all connection concept in my home and my secondary place to avoid compatibility problems when moving projects.
Well, don't take me pls like hopeless stuborn guy but regardless of possible reconfigure what I have or replacing card I still believe Sonar should have functionality to reconvert flawlessly when needed projects with different data rates. Different things happen and it is too optimistic assume that always destination hardware will have every data rate as source. It is not big deal, I think, to implement it to remove some potential hardware incompatibility.
Regards,
Piotr