In this case, the DAC is not a hi-fi dac but a device for production (semi-professional). The users will have different wishes. The ASIO driver is most suitable for this (eg low latency) and a development of Steinberg itself.
I used the WASAPI but the latency still isn't quite low enough. I'm measuring about 80ms round trip using USB microphone and audio devices. I tested the new drivers mentioned and successfully got lower latency and smaller buffer sizes, but the only drivers mentioned seem to be the "High Definition Audio Device" driver, which I traced to hdaudio.sys. However, typical USB audio devices seem to use "USB Audio Device" drivers, implemented in usbaudio.sys instead I believe, which isn't allowing smaller buffer sizes.
Generic Low Latency Asio Driver 33
For those looking to operate generic USB audio hardware on Windows at low latency, the KoordASIO driver provides a convenient ASIO-WASAPI bridge, enables either WASAPI Shared or Exclusive mode, and configurable buffer size. 2ff7e9595c
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