Looks very interesting, I might switch from PortAudio to this for my project. But I think I'll wait a bit though, I'm not quite ready to give up on WinXP/Vista support yet.
It relies on WASAPI for Windows, so it should work on Vista which is the first version to introduce that API (unless I missed another requirement).
And as a side note, that is definitely the way to go. WASAPI is a massive improvement over previous windows audio APIs, especially for low latency / pro audio. I'm flabbergasted that some DAWs still don't support it.
I'm confused, does it support Vista?
The PortAudio comparison made me believe it doesn't, as this is written in PortAudio's pros : « Supports older versions of Windows than Windows 7. » [1]
I've only tested on Windows 7, but looking over the API functions I used, I could probably relax the restriction to Vista. I'm not sure I'd be willing to extend testing and support to Vista without getting some funding. It feels harsh to say, but I have ambitious plans which will be stalled if I git bogged down with deprecated and proprietary software.
And as a side note, that is definitely the way to go. WASAPI is a massive improvement over previous windows audio APIs, especially for low latency / pro audio. I'm flabbergasted that some DAWs still don't support it.