The Sound class has a property named PlaybackLoudness, indicating how loudly the sound is being played on a scale from 0 to 1000. Knowing this, you can change the size of the boombox part. I’d highly advise you use a MeshPart, since it’s easier to use than regular meshes. Just store the default size somewhere in your script and change it according to the playback loudness using the Instance::GetPropertyChangedSignal event.