You used to be able to do that on Linux when its sound system was OSS ("Open Sound System", not "Open Source Software"), the same as FreeBSD uses today (I believe Linux still has an OSS compat layer). A long time ago the project lead was employed by a company to write support for some newer sound hardware, and decided to make those changes proprietary. The Linux folks decided to do something completely different, and we got ALSA, while some BSD folks decided to fork the last fully open source version of OSS and continue developing it.
The irony, of course, is that the proprietary version of OSS failed, and it ended up going open source again.
The difference is that on Linux, only one process can open /dev/dsp, which is why you need shims like aoss or padsp to run older games or other audio-programs without stopping all other sound sources / your sound server.
IMO, /dev/dsp was the right approach and should have been extended instead of being replaced with entirely different interfaces.
The irony, of course, is that the proprietary version of OSS failed, and it ended up going open source again.