"'AudioSpeakerMode.Raw' is obsolete"

Hi! I'm using the latest stable Unity version (2019.2.0f1) and the latest PUN 2 + Voice 2 (my build target is Android). All works fine, except I'm getting this single error:

Assets\Photon\PhotonVoice\Code\WebRtcAudioDsp.cs(43,14): error CS0619: 'AudioSpeakerMode.Raw' is obsolete: 'Raw speaker mode is not supported. Do not use.'

Out-commenting the line in question, {AudioSpeakerMode.Raw, 0}, fixes the issue. I did wonder though what this was. Thanks!