User-defined speaker types, to be extended in the negative range. Will be handled as their corresponding speaker types with abs values: e.g abs(#kSpeakerU1) == #kSpeakerL, abs(#kSpeakerU2) == #kSpeakerR
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User-defined speaker types, to be extended in the negative range. Will be handled as their corresponding speaker types with abs values: e.g abs(#kSpeakerU1) == #kSpeakerL, abs(#kSpeakerU2) == #kSpeakerR