I have the D90 MQA and seem to have an issue with WASAPI not working with the official Topping drivers installed. With the Windows 10 class 2 drivers, it works fine, MQA works, but I don't have ASIO. With the Topping drivers, I get good ASIO, but WASAPI is broken and no MQA over WASAPI. Just FYI - if you need both ASIO and WASAPI to work, stay away from the MQA version because there's no working driving right now that provides both. The regular D90 shouldn't have this issue, according to their support. It has something to do with 32 bit audio not being supported by MQA libraries yet, they said once they support it, there will be a firmware upgrade, but who knows when that will happen.