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I downloaded from your drop box, but I cannot install the add-on, it says "Add-on does not have correct structure".

You should manually copy the addons folder in the Kodi userfolder (on windows "C:\Users\<username>\AppData\Roaming\Kodi\addons").

I did that and then I have AUDIO DSP in Enabled Add-On, but I could see the AUDIO DSP MANAGER in Setting-System-Audio Output. What I want to achieve is that I wish I can select Left or Right channel for audio output. Some of my Real Media files have two audio languages, one language on one channel. I want to have simple way that I am able to select only one channel at a time for audio output (still output to 2 speakers with same audio source though). I am not sure if this plug in can do that or not.