correct. wasapi was written by microsoft and introduced in Vista / now featured in Windows 7
(ASIO is an early implementation and should be used with XP)
in layman terms, it allows the playback client to take full control of the audio stream (exclusive mode) and 'speak directly' to the audio driver/soundcard. the direct path allows for a bitperfect stream output.
before wasapi the OS would/could/does 'mess and mix' the sound output -depending on playback variables.
currently OS X and Linux do not offer a bitperfect solution ATM and microsoft media products do not currently support their own wasapi code yet..go figure.
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Windows Audio Session API – Very low level API for rendering audio, render/capture audio streams, adjust volume etc. This API also provides low latency for audio professionals through WaveRT
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