Computer Audio Asylum

Music servers and other computer based digital audio technologies.

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Original Message

ASIO vs. Windows access to a Sound Card

Posted by Tony Lauck on July 31, 2012 at 07:07:52:
The driver for a sound card determines what happens when ASIO and the Windows stack try to play at the same time. I used to believe that when one application was using a device via ASIO that all other access was locked out, but this proved not to be the case, at least with the 64 bit Juli@ driver. Instead there is mixing and (I believe) sample rate conversion by Windows if it is using a different sample rate than ASIO. With my Mytek Stereo192-DSD DAC there are more complex possibilities, e.g. ASIO can be running the DAC in DSD mode while Windows is trying to run it in PCM. I have no idea what is going on with these drivers, nor do I really care. I just take care not to run both of them at the same time.