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you can even make him sing custom songs too. if you open the browser console to run javascript, you can use playsong() and pass it an array of values corresponding to the midi note to yip. if you pass a value as a 2-length array, it does midi note and length to wait after!
here's where the example songs are in code: https://github.com/koboldyipbot/koboldyipbot.github.io/blob/main/js/yip.js#L44