Not to toot my own horn but,
You might want to take a look at my software for the QA403 → MZachmann/QA40xPlot: Control a QA40x with a standard Windows GUI
Also check out these two threads.
Discussion of the software: QA40xPlot Thread - QuantAsylum Forum
My solution to the dreaded ‘make your own cables’: An XLR cable adapter - QA40x - QuantAsylum Forum
One big advantage of QA40xPlot vs using ASIO is smart control of the attenuator and output gain settings.