AnalyserNode's output should only have one channel. We currently use 2 channels, which is inconsistent with Blink and Gecko.
Created attachment 412184 [details] Patch
Committed r268926: <https://trac.webkit.org/changeset/268926> All reviewed patches have been landed. Closing bug and clearing flags on attachment 412184 [details].
<rdar://problem/70622098>