If you want to to have the UI play sounds in specific situations, you just need to add a sound file and select it for the relevant context.

• Pick any .wav, .mp3, .ogg, ... sound file.
  • Here's an online collection of ding sounds if you want https://bigsoundbank.com/search?q=notification
• Store the file in SwarmUI/Data/Audio
• Refresh your Swarm page or restart Swarm (file listing does not currently auto-update, TBD)
• Go to User -> User Settings
• Find the Audio category, pick your saved file for whichever sound event you want
  • Completion Sound plays when all current queued generations complete
  • Optionally set the volume too
  • hit Save
• Go trigger the event to see it (eg generate things to hear the completion sound)
• You can change the audio event back to the blank entry at the top of the dropdown list to disable sound playback