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Closed per http://www.w3.org/2011/audio/track/issues/10 solved by this changeset: https://dvcs.w3.org/hg/audio/rev/908b6b7b8702#l1.174 «This interface is a particular type of AudioParam which specifically controls the gain (volume) of some aspect of the audio processing. The unit type is "linear gain". The nominal minValue is 0, but may be set negative for phase inversion. The nominal maxValue is 1, but higher values are allowed (no exception thrown).»