I got one. See www.henryaudio.com
The firmware is open source and can be explored in full detail. It uses a
feedback IN endpoint. Forks of the same code use an ADC IN endpoint to let
the Host determine the sample rate.
It works on everything but iOS. I suspect a minor descriptor bug there
because OS X took a bit extra convincing to accept it. It has debug modes
to verify that the async feedback logic is working.
Perhaps interestingly, the same firmware also does async UAC2. There is an
open source ASIO driver as well.
On Wednesday, March 16, 2016, Robert S. Giaraffa <Robert.Giaraffa@xxxxxxxxxx>
On Windows 7, is there an easy way to determine if a UAC1 audio device
supports Asynchronous mode without downloading any external utilities (e.g.
Thesycon Descriptor Dumper)? I’m asking a number of my co-workers if they
have a UAC1 device that supports Async mode, and would prefer that they be
able to tell this before bringing me the device.