Always nice to find interesting little browser exercises, and Patatap is just such a toy. Nothing too sophisticated, more like a simple tune maker which combines visuals and sounds in an entertaining way.
To play, press the spacebar to cycle through the sound and color palettes, and then press any key from A to Z and have fun. It’s a bit tricky at first to get the timing and sound triggers in sync, but once you get the hang of it, things can get nicely interesting. Take a look at the video below to get an idea. More here.