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2) There's some auto-switching between the channel inputs of the same line whereby if you plug something into the R channel, you have to have something plugged into the corresponding L channel.

Appreciate any augmentation to my knowledge on this topic.

Thanks,
- DK

yes there is switching.

if you have a mono source, plug it onto L in and it will feed both L and R.
if you have a stereo source plug L to L and R to R.

plugging only one input into the R is not defined.

mark