Difference between plugin button and plugin window on-off buttons

#1

Okay I am confused about something.
I had thought that the
Mixer channel plugin buttons on/off green led lights
performed the same action as the
Plugin window toolbars on/off red lights
Because this is common in other applications that I have tried.
However I have recently been told that this is not true in Ardour.

QUESTION 1
Can someone tell me what are the differences/benefits to having these two different on/off led buttons?
I have been told that the Plugin window red on/off led is a bypass where no signal is being sent through the plugin? What is the green led doing?

QUESTION 2
Might not be the same thing, but it has been mentioned that Ardour does not actually completely turn off a plugin, when you turn “off” a plugins button green led light, it is said that it still uses CPU/DSP.
I had mentioned in the past that I wish there was a true off (or close to it), where a plugin that uses high DSP even at idle, could be turned “off”
Do any of these on/off buttons relate to this?

QUESTION 3
Before I made a new request post.
I will just ask here, if they are not the same, then should Plugin window toolbars also get a green on/off led that triggers the Plugin buttons green led on/off?

Thank you for any info shared

#2

No, this has been discussed many times in the past.

Ardour asks the plugin to bypass itself (since only the plugin known how to click-free bypass itself). Only if the plugin does not support this, Ardour hard bypasses the plugin.

Ideally DSP load does not change. Then, when you enable a given effect in the middle of a [live] session or automate bypass/enable there cannot be a CPU spike causing dropouts.

It’s a hallmark of a good plugin when the load remains the same regardless of input and active/disabled state.