Chime, as spun up in the Forest, Kiwiburn 2016. Here, watch this to get the idea...

Chime includes:

• The sounds module - plays a number of wave files precisely in sync
• The launchpad module - interacts with a Novation LaunchStation through USB midi. Here it has the moving line and toggle buttons but obviously butchering out the useful bits is throughly doable.
• A data model, the primary interface to the internal state of the LaunchStation (use whatever.leds)