About the nRF5340 Audio source

[Junichi]

I would like to confirm how to make nRF5340 Audio stereo.

The nRF5340 Audio source is mono, and to make it stereo
I believe that it is necessary to convert the data between the I2S LCS3 codec and change the LC3 codec to a stereo setting. Is this correct?

[dejans]

Hi,

If you have a custom board, you need to have a hardware codec chip which supports stereo. You can read more in the testing section note. Required software changes given for reference can be found in this thread. 

Best regards,
Dejan