ModernUI has a startup ding sound they play. This sound is played (queued to the sound engine) before mods have a chance to finish initialization. To address the issue, set the "ding" property in the ModernUI client.toml file to false. (Dynamic Surroundings plays a startup sound so this feature would be redundant.)

69 dude!

Put in place a workaround. Just the other day I was thinking about removing some code because I didn't use it. Well, I am now using it.

Posted 0.3.1 versions to CurseForge/GitHub.