I think this is the most important store note.
M-Audio Fast Track Ultra (No Longer Available)
Included power supply required for full 8 x 8 operation
You don’t get multi-channel operation with USB power. Are you using the wall power supply?
Full ASIO 2.0, WDM, MME, and Core Audio support
Is ASIO required for multi-channel operation? Audacity doesn’t easily support ASIO.
We wrote a thing on multi-channel.
https://forum.audacityteam.org/t/multi-channel-recording-in-audacity/15644/1
Koz