It should also be noted that NetBSD is exactly the same in this regard, I believe OpenBSD's audio interface is a descendant of the work done in NetBSD.. including the ossaudio(3) wrapper libraries.
http://netbsd.gw.com/cgi-bin/man-cgi...4+NetBSD-1.3.3
http://www.openbsd.org/cgi-bin/man.c...th=OpenBSD+2.2
http://netbsd.gw.com/cgi-bin/man-cgi...3+NetBSD-1.3.3
http://www.openbsd.org/cgi-bin/man.c...th=OpenBSD+2.2
Often the two merge changes from each other, and NetBSD doesn't have a OSSv4 port either.
From the looks of things, tracing commit logs.. and man pages.. it's been around since the very first releases of both NetBSD and OpenBSD.
That's over 11 years of independent development my friend.. worthy of some respect.