You're looking for information on the Behringer USB audio driver, specifically for the UltraMix 28/40 model. Here's what I found:
Check the available downloads for your specific operating system. 2. The Official ASIO4ALL Driver behringer usb audio driver 28 40 download top
) are "class-compliant" and do not need dedicated drivers on modern systems, users often find that the generic Windows USB audio driver lacks the advanced features required for professional audio work. You're looking for information on the Behringer USB