MediaStreamAudioSourceNode when there's more than one audio track

The spec currently says "This interface represents an audio source from a
MediaStream. The first AudioMediaStreamTrack from the MediaStream will be
used as a source of audio." Wouldn't it make more sense to use all the
enabled audio tracks, mixed together? That's what people will hear if they
feed the MediaStream into an <audio> element.

Rob
-- 
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