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OSS4 from SBo, which I am the maintainer of, will work just fine with 14.0. I have not tested it with 14.1, but I see no reason it wouldn't work.
OSS3, which is part of the kernel, works out of the box with 14.0. AFAIK it needs to be enabled explicitly in 14.1 (see post #2). Note that OSS3 has the significant drawback of only being able to play one audio stream at once, while ALSA and OSS4 both do software mixing. On 14.0, I disable OSS3 by commenting out the load_oss_modules lines in rc.alsa.
I use ALSA, but that's only because I use USB soundcards exclusively, and OSS4 doesn't work with USB soundcards. OSS4 is a fine option otherwise. For one thing, it has a much nicer graphical mixer that lets you adjust the volume separately for each application.
ALSA always has sound mixing for applications that output to ALSA.
Under ALSA, applications that output to OSS and are handled by ALSA's OSS emulation layer do not get sound mixing. The way to deal with that, honestly, is to just disable ALSA's OSS emulation layer. It's disabled by default in 14.1.
i'm aiming for peacuful co-existence of ALSA and OSS applications. I have found two mutually exclusive solutions: either the in-kernel oss compatibility layer, or libaoss via a wrapper script called aoss. The latter is superior in that it provides ALSA mixing capability. Unfortunately I didn't get some ancient 32 bit binaries like quake3 to work with libaoss...