WASAPI is a low latency driver.

It is Microsoft’s own ASIO.

When used in shared mode, it is equal to Direct Sound.


When used in exclusive mode WASAPI bypasses the Win audio engine.

It transports the output of the media player directly (and unaltered) to the driver of the audio device.

It also has a (exclusive) lock on the audio device.

No other application can use the sound card.

No more system sounds at full blast over the stereo!


As it is exclusive (only one stream playing) no need to mix so no need to resample and to dither the audio stream. This means each audio file can be played at its native sample rate without user interference (automatic sample rate switching).