I've tried every setting I can for sound using the "Launch Settings", but can't seem to get any sound to play at all. I'm not sure what all information might be needed about my rig, but I can say that I'm outputting everything from my gtx970 to a receiver - which splits the signal into video for the monitor and audio for the sound system. Haven't had any issues using this setup for modern games/programs, but this one is giving me fits.

Any suggestions?

Maybe try to play around with the dosbox config file? Some info: https://www.dosbox.com/wiki/Sound#Sound_Blaster

Do you have other dosbox games and if so do they function correctly?