I see there are both 'Gain' and 'Volume' envelopes in the track view. 'Gain' seems to be the same as the ones I used in pa-8. Do you know what the difference is?
I assume you are speaking of the clip gain envelopes, versus the track volume envelopes. If so, here's what I *think* the difference is.
Gain is additive to (or subtractive from) the track volume setting, whereas the track volume envelope changes the
absolute setting of the track volume.
So, if your track volume is set to -10 db, and you put a gain envelope on the track and set it to -2 db, it will subtract 2 db from the absolute setting of -10 (i.e, -12 db) for the portion of the track where the envelope kicks in.
In the same situation (volume setting of -10 db) if you put a volume envelope on the track and set it to -12 db it will change the absolute track volume setting to -12 db.
And now you might be asking , "But gee, Mike, isn't that the same thing?" Well, yes and no, grasshopper.
In case # 1 (the gain envelope), if I should later decide to change the track volume setting from -10 db to let’s say -5 db, the gain envelope will still do its thing, and deduct -2db from the track setting (yielding a -7db level for the portion with the envelope). But in the case of the track envelope, it will simply change the track back to it's orginal setting (in this case, back to the original -10db that the envelope is set at).
Maybe the easiest way to understand this is to look at the faders in Console View. With a track volume envelope on the track, you will actually see the faders actually move up and down as the track reaches the envelope nodes where the changes are programmed.
However, if you do the same thing with a gain envelope, the faders remain motionless. This is because the absolute setting of the track is not changing, rather a +/- gain is being applied to it. The advantage of this is that it allows you to play with the absolute volume setting of the track as you try to sit in the overall mix, but without affecting your programmed volume changes within the track itself.
One other thing, if you put a clip gain envelope on a track with several clips, the envelope will only span a single clip and not the entire track.
I hope this makes sense to someone, as it got a lot longer than I had anticipated. Whew!