alsa socket for a sandboxed browser

[jyoung]

I'd like to setup a sandboxing system for my browser, and I'm following this recipe

https://wiki.gentoo.org/wiki/Simple_sandbox#Install_and_configure_sudo

It works fairly well, but there's one aspect that's tripping me up. The tutorial explains how to create a socket for the pulseaudio daemon, so that the sandboxed browser can play sound. But, I use alsa instead of pulseaudio. Does anyone know how to create a socket for alsa?