0: Original mode.
1: Left channel mode. This mode replaces the audio of the right channel with the audio of the left channel, which means the user can only hear the audio of the left channel.
3: Mixed channel mode. This mode mixes the audio of the left channel and the right channel, which means the user can hear the audio of the left channel and the right channel at the same time.
2: Right channel mode. This mode replaces the audio of the left channel with the audio of the right channel, which means the user can only hear the audio of the right channel.
The channel mode. Set in setAudioMixingDualMonoMode.
v3.6.1.4