In DOSBox 0.65 it is impossible to change GUS's base address; it is 240h constantly.

In dosbox.conf:

[gus]
gus=true
rate=22050
base=220
irq1=5
irq2=5
dma1=1
dma2=1
ultradir=E:\ULTRASND

On screen after launching DOSBox:

Z:\>set
COMSPEC=Z:\COMMAND.COM
BLASTER=A260 I7 D1 H5 T6
ULTRASND=240,1,1,5,5
ULTRADIR=E:\ULTRASND
PATH=Z:\;d:\archiv;e:\ultrasnd;d:\volkov

In DOSBox 0.63 it was working... 😕