Castle of No Escape 2 (542350)

Compatibility Report

• Name of the game with compatibility issues: Castle of No Escape 2
• Steam AppID of the game: 542350

System Information

• GPU: GeForce 940MX
• Driver/LLVM version: nvidia 410.78 (Upgraded drivers with no luck.)
• Kernel version: 4.15
• Link to full system information report as Gist: https://gist.github.com/marcsances/8432c95037994d781a0535d368fc4fa0
• Proton version:
  Proton 3.7-8: works with no sound effects
  Proton 3.16-4: couldn't launch the game in this Proton version
  Proton 3.16-6 Beta: can launch the game again in this version, with no sound effects

I confirm:

• that I haven't found an existing compatibility report for this game.
• that I have checked whether there are updates for my system available.

steam-542350.log

Symptoms

Sound effects do not play, but music plays fine. Rest of the game is fully playable.

Reproduction

Start a game and you'll notice there are no sound effects, but the music plays.

Start by reviewing steam-542350.log and the reported behavior under Proton 3.7-8, 3.16-4, and 3.16-6 Beta. Reproduce the game launch and audio behavior using the listed system information, then identify why music works while sound effects do not. Done means sound effects play reliably without regressing launch or music playback.