oss is the old linux sound system replaced time ago by alsa, but some apps yet use oss or work better with it.
aoss is a wrapper around oss that converts oss api to alsa calls, there’s another package that should do the same but automatically without using nothing in command line:
apt-get install oss-compat
if that doesn’t work, as in linux you need the clickToLaunchApp.sh script to run apps, you can edit the script in the export directory to execute your app using aoss:
the oss-compat didn’t work for me, but the aoss is ok for the moment. unfortunately, aoss seems to create horrible freezes/crashes when exiting the app… so i have to find a some better solution when i have more time. i am curious, do you suppose it is the fmod lib that is choosing to use the older oss system instead of alsa? i have all my system sound settings set to alsa (as far as i can tell)