That file doesn't allow loading modules, so I just used "pactl load-module" in autostart.sh.
For anyone who finds this thread looking for info, also consider the following:
• Use the Pulse module "module-udev-detect".
• Container probably needs to run as root and so do the users in it (for access to Pulse).
• Won't play audio alongside Kodi if ALSA is used, and UI sounds may need to be turned off for playing while on UI.