Hi, has anybody on the list experience with getting a USB Audio Class 2 device with a propietary driver pass the audio device tests in HCK for Windows 8.1? I am seeing a number of severe issues here with some of the tests: (1) KS Position tests do fail due to startup timing and jitter issues (2) Lullaby test does fail due to startup / shutdown issues on the USB isoc stream (3) General Audio test fails (on Windows 7 only) due to a failure IOCTL\KS defined\IOCTL_KS_WRITE_STREAM\Cancel IO test Some research in the HCK filter database shows that there are filters for such issues for the inbox USB Audio Class 1 driver (and the Bluetooth audio stack), so it looks like this kind of problems is known to Microsoft. Can anybody shed some light here? Thank you very much in advance! ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.com/