AFAIK, the package should  use DEVOSSAUDIO/DEVOSSSOUND from
mk/oss.buildlink3.mk.
I don't have much of a working system right now, so could you check to
see if this is hard-coded into the application, or if this is in a
default configuration file?  Then we can fix it either with SUBST_SED
or changing the code to use a package-defined variable for the audio
device.

--Blair