Playing complex MIDI files triggers thousands of audio events simultaneously. This will instantly crash Minecraft if you are using the default 2GB of RAM. Open your Minecraft Launcher.
To understand why this system is called "ultralight," it helps to break down exactly what happens behind the scenes from the moment you hit play to the moment the sound reaches your speakers. 1. Note Isolation and Sampling ultralight midi player resource pack work
One user on Reddit shared a tip for avoiding a specific recurring nuisance: Playing complex MIDI files triggers thousands of audio
When a MIDI player triggers sounds in Minecraft, it does so through command execution. Every note played is a command sent by the server or the world logic. If a MIDI file is complex—say, a dense Rachmaninoff piano concerto—the game engine can choke. The "Single Tick Problem" is the enemy of the ultralight builder. When too many sounds are triggered in the same game tick (1/20th of a second), the sound engine can cut out, leading to "note dropping," where the melody becomes a stuttering mess. To understand why this system is called "ultralight,"
Have you verified that your client audio volume sliders are enabled for the specific category utilized by the mod?