Yeah, I understand, that is why I said it is not DirectX, but being in DirectX or not is just marketing. The reason is that XAudio2 (and lower level ones and o

Yeah, I understand, that is why I said it is not DirectX, but being in DirectX or not is just marketing. The reason is that XAudio2 (and lower level ones and other non-audio ones) is developed, distributed and recommended by Microsoft, and it is used by many major games and audio engines. So I don't understand who cares about whether it is formally part of DirectX or not. I didn't claim there aren't alternatives like OpenAL or Wine's XAudio2 implementation. I simply said the original XAudio2 is not portable on its own, which means you cannot simply use it in Linux, for instance.