Foobar2000:Components/Kernel Streaming support (foo out ks)
From Hydrogenaudio Knowledgebase
 Kernel Streaming support
Kernel Streaming support allows bit-exact playback bypassing Windows mixer.
With certain soundcards, Kernel Streaming mutes all other sounds while playing. However, this behavior entirely depends on soundcard driver implementation details and varies between soundcards. If you need all other sounds muted, consider using WASAPI instead.
 Operating Systems
This component was originally written for Windows 2000 and Windows XP. It is not guaranteed to cooperate with newer versions of Windows.
Kernel Streaming is known to work on certain Windows Vista and Windows 7 configurations, but not with devices having WaveRT drivers such as High Definition Audio Devices integrated with newer motherboards - such devices simply won't be shown on foobar2000's output device list as available KS devices.
If you run Windows Vista, you should be using WASAPI instead in most cases.
This component is known not to work at all with certain hardware, such as certain laptop onboard audio devices.
Using Kernel Streaming may expose device driver bugs that can't be triggered otherwise and lead to system instability. Use this component at your own risk.