Was tagging an album today and saw something I have not noticed before. In Mp3Tag I right clicked and selected extended tags. This is what I saw-
WAVEFORMATEXTENSIBLE_CHANNEL_MASK w a value of 0x0000. I do not know where it came from and could not find a way to delete it.

Anyone know what it is and if it's a potential problem w LMS ?

The album is a live concert downloaded from TTD Gillian Welch Live And Obscure