PS I found it much easier just to flash a desktop version of rasbian and install pavucontrol as its really simple but you can see the inputs via a really simple mixer side by side so it will show multichannel original and ech cancel side my side.
Each change just pulseaudio -k and the daemeon will auto restart with new settings.
Prob best to get a feel and setup there or at least was for me being a dummy.
Using audacity and pavucontrol made things much easier to get a feel for things.
Its real easy to setup the inputs via the config panel
https://imagebin.ca/v/5Dakzgv5wbAD
Then just view the inputs