have you tried VDM Sound instead?
describtion from abandonia:
VDM Sound
VDMSound is a program that overcomes what has probably been the most exasperating limitation of DOS boxes since Windows NT - sound support. VDMSound emulates SoundBlaster compatible as well as Adlib music. In development are improvements to the existing joystick emulation, and possibly VESA support. It is a self-contained, 100% software emulation program that is completely independent of your audio hardware type and settings. VDMSound works with any soundcard, and will even work on computers that have no audio hardware at all. This software is highly recommended if your computer is too slow for running DOSBox as it will start most games in regular WinXP command prompt.
http://www.abandonia.com/utility/VDMSound%202.1.0.exe
all you need is to install it. then when finish, restart computer, find your screamer exe file(ie the file that starts the game), right click on it, and choose "run with VDMS"