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Can not load songs on hooktab

When loading a song on hooktab (e.g https://www.hooktheory.com/theorytab/view/alt-j/breezeblocks), a javascript exception was thrown.

error message detail like that:
Uncaught (in promise) TypeError: Cannot read property ‘gain’ of undefined
at Object.playFromState (theorytab.js:191)
at theorytab.js:191

So I can not listen any song.

We pushed an update today that fixes this problem. Can you try again and see if it works for you? Currently plays fine for me in Safari, Chrome, and Firefox (YouTube and piano instrumental versions)