Turn off the legacy prefixed WebAudio API.
Created attachment 409496 [details] Patch
*** Bug 216891 has been marked as a duplicate of this bug. ***
Created attachment 409502 [details] Patch
Committed r267504: <https://trac.webkit.org/changeset/267504> All reviewed patches have been landed. Closing bug and clearing flags on attachment 409502 [details].
<rdar://problem/69462804>