I googled/binged M-Audio Fast track ultra USB soundcard win 10 drivers and found at least two sites that had Win 10 drivers:

http://drivers.softpedia.com/get/SOUND-CARD/M-Audio/

http://www.driverscape.com/download/m-audio-fast-track-ultra


I think my wife has started to show the first signs of dementia.
She said she can't remember what she ever saw in me!

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware