It’s an Interface with light and sound. When you push a switch for a short time , a ripple of lights spreads out from the switch that corresponds with the sound you have chosen. If a switch is held down slightly longer, a dot of light remains on the panel indicating that the light and sound will be play repeatedly. One remarkable effect of this sound and light synergy is that people seem to quickly understand the relationship betweent the sounds and switches.
I am curious to see this in action..