What is the difference between the audio gain and the green volume line (Camtasia 9)?

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Camtasia 9 allows adjusting the volume of an individual clip with the green line. It is not clear what the difference is. I can increase the volume of a clip to a certain level with the green line and then add even more volume with the gain control. I can adjust multiple tracks with the gain, but this does not move the green line. But are these really doing the same thing or do they do something different (hidden) to the audio?
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Posted 2 years ago

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kayakman, Champion

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I answered this in detail!!!  Looks like that post vanished?

bottom line; both generally do the same

but they behave differently and affect audio on different tracks differently

maybe TechSmith can chime in here
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Thanks for chiming in champ and telling us that you've already answered this in another post that has gone MIA.

So here is what I found:

Volume usually means the decibel (dB) output of a sound system. Basically, volume is how loud something is after it’s been processed.

Volume = loudness. It’s the loudness you hear.
The volume does not change the tone of the sound. It just makes it louder.

Gain is the decibel (dB) input of a system. So the gain controls how loud something is before it goes through any processing. 

How loud something is AFTER processing doesn’t change the tone of the sound. But how loud something is BEFORE processing definitely will.