As for me, this is just an example when the Channels can be useful. As examlple, in MIDI to PangoScript you use two commands, the fist set the channel to the value, and second command set the second channel to inverted value. Main goal - two channels dependent, and controlable by MIDI slider. After that, you can use these Channels in Oscillating, Color or Key effects. Channel is a fast way for calculation.
There is similar way, by means of Input inside Effects, same story but less flexible.
OK, I recommed to try Channels.
... in some places that use Channnels is possible to set min and max values, what actually allow to use one channel instead of two.
Regards,
Alexey.