Thank you very much for so much detail informations.
Inspired by you, I solved this problem by turn dom.webaudio.enabled to True in the about:config page, dom.webaudio.enabled is True in official Firefox-ESR but False in Tor Browser due security reason.
For all peoples who want to really keeping anonymous: If the service don’t work with default security configuration of Tor Browser then it is danger thing for you and you should seek a alternative service.
This solution just for who want to cost at security to get functionality(e.g people who merely use Tor Browser as one anticensorship tool don’t care anything of anonymous).
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