When I try this on Firefox on Linux (not incognito) I get the following error:

  Connecting AudioNodes from AudioContexts with different sample-rate is currently not supported. index-0dae94e71b526640.js:1:2992
  Uncaught (in promise) DOMException: AudioContext.createMediaStreamSource: Connecting AudioNodes from AudioContexts with different sample-rate is currently not supported. index-0dae94e71b526640.js:1
  Media resource blob:https://www.ermine.ai/e762a6f1-f292-4b23-96e0-8059a7f9d635 could not be decoded. www.ermine.ai
  Media resource blob:https://www.ermine.ai/e762a6f1-f292-4b23-96e0-8059a7f9d635 could not be decoded, error: Error Code: NS_ERROR_DOM_MEDIA_METADATA_ERR (0x806e0006)

(also, the weights json doesn't download at all in Firefox incognito).

Would be good if you could pop some kind of alert (literally alert() might do the trick) on an exception just so people don't wait for a couple of minutes before realizing something's gone wrong :)