installing the drivers can cause some problems because no real gus is found or an real autoexec.bat is missing.
i suggest to simply use pre installed drivers
like this onehttp://www80.zippyshare.com/v/c6N015fi/file.html
this pack contains GUS 4.11 drivers + Pro Patches Light 1.61 + Pro Patches Lite 1.61 corrected anti looping patches (includes 3 ppl 1.61 patches found by Tsyu removing a looping bug)
for those who want to know: its the pack from Huggybaby just with ppl 1.61 anti loop fix from Tsyu and with modified ultrasnd.ini file
(i changed patch folders in ultrasnd.ini from e:\ultrasnd\midi to c:\ultrasnd\midi because Eero Räsänen the creator of ppl made this small mistake in his 1.61 ultrasnd.ini file)
the driver was installed to c:\ultrasnd
so i suggest mounting it to that folder (because all gus ini files are set to c:\ultrasnd)
and important tip !
if u want to use gus emulation in dosbox
use an actual svn version from emucr and NOT 0.74 !
with dosbox 0.74 gus will have only mono sound for sfx and music !
(fixed with svn versions)