When you build multimedia web applications, synchronizing audio with visuals is essential for crafting immersive experiences. Timing coordination ensures that musical events—such as beats, notes, or sound effects—happen precisely alongside corresponding animations or visual changes. This alignment is crucial in contexts like games, interactive music tools, or educational apps, where users expect audio and visuals to reinforce each other seamlessly.

Tone.js provides tools for precise audio scheduling. By using Tone.Transport and scheduling both sound events and visual updates on the same timeline, you can avoid drift and keep everything in sync. The Tone.Draw.schedule method is especially useful: it schedules visual changes to occur in lockstep with audio events, compensating for browser rendering delays. This approach ensures that, for example, a shape pulsing or color changing on the screen happens exactly when a note is played, creating a unified and engaging user experience.