Web audio player demo using purescript-halogen and a basic service worker script.
See the blog post about this here: http://qiita.com/kimagure/items/653c52e77d7cd3567498
I gave a talk about this at Helsinki Haskell in May 11 2017: https://speakerdeck.com/justinwoo/make-yourself-a-web-audio-player-with-purescript-and-halogen