Hi Henkelmax,
If I'm playing Minecraft single player and I "Open to LAN" from settings, or I "/publish " my game to get a static port number, Simple-Voice-Chat picks a random port # to open for its server service. I haven't really tried your mod yet because of this, though the general settings look easy to understand. I like the idea that it works with SoundPhysicsRemastered, and that it has positional audio, so I look forward to trying it out.

Thank you for your efforts on this mod.
Mike

This was done on purpose, since Minecraft also does not use its server port for LAN worlds.