This headset uses a very weird channel layout, 3 channels where the first one unknown/unused - I've never seen such an odd setup before:
Kodi doesn't cope with that too well, it expects to get a normal 2-channel setup with left and right.
It might be possible to work around that by creating a /storage/.config/asound.conf file (that's the equivalent of ~/.asoundrc on other linux distros) and creating a custom pcm using the route plugin.
read more about it here: https://www.alsa-project.org/wiki/Asoundrc here https://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html and some LE specific info in this forum thread RE: Volume Control for Chrome Add-On
so long,
Hias