Avidemux as docker container on Synology - how to access sound?

[fistfullobeer]

May be a long shot here, but I'll take a shot.

I am running portainer on a Synology 1823xs+

I have created a stack for avidemux and everything works fine as far as video playback but the audio does not playback. I get the error "Trouble initializing audio device" My compose looks like this:

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version: "3"
services:
  avidemux:
    image: jlesage/avidemux
    ports:
      - 5700:5800
    volumes:
      - /volume1/docker:/config:rw
      - /volume1/docker/avidemux/test:/storage:rw
    environment:
      - DARK_MODE=1
When I try to add

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- /dev/snd:/dev/snd
I get the error

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Bind mount failed: '/dev/snd' does not exist
Can anyone tell me if there is different location for the sound device in my Synology or if there is another step I need to take to get the container use the sound device? Thank you