To get FLIGHT to work correctly with your GUS you MUST have
your IRQ set to something less than 8.
Just do the following and you should be okay:
                 /-> This 3rd 5 is the IRQ (it needs to be <=7).
SET ULTRASND=240,7,7,5,5
ULTRINIT

Do an ULTRINIT to finalize these settings.
Recommended that you have a fast machine (>= 486DX).