Sorry, my bad. I meant you can't set FFTSIZE higher than 2048 and we need at least 8192 to identify notes correctly (at least in Safari). Does Firefox allow higher FFTSIZE than the default?
Yes, up to 32768, per spec [0]. It's just that Safari does not implement this part of the spec, which has changed in early 2015 to allow for longer FFTs [1].
[0]: https://webaudio.github.io/web-audio-api/#dom-analysernode-f... [1]: https://github.com/WebAudio/web-audio-api/issues/375