From my dosbox-0.73.conf file:

1gus=false
2gusrate=22050
3gusbase=240
4gusirq=5
5gusdma=3
6ultradir=C:\ULTRASND

Yet in Duke Nukem 3D's setup -> Sound Setup -> Choose Sound FX Card, selecting Gravis Ultrasound produces a "Ultrasound IRQ must be 7 or less." error. Given that I'm able to set "Choose Music Card" to "Ultrasound" without any problems, my inability to set the Sound FX card to Gravis Ultrasound really doesn't make a lot of sense to me.

Any ideas?

edit: it'd appear that not even the Music Card works. If I go to "Test Music Card" I get the same "Ultrasound IRQ must be 7 or less." error as well.