ChannelRemappingAudioSource docs/confusion

Hello all (/Jules),

I've been staring at the documentation of ChannelRemappingAudioSource for a while now and it is REALLY confusing. It would be rather good to give two very simple examples: left|right to mono downmix and mono to L|R (copy of the same channel) in the documentation.

Just reading the docs I basically fail to understand how I should be doing things.

 - Bram