Jesse G
No solution to perform on 200 songs at once, that would be a miracle.

LOL - well, I wasn't talking about a mass edit, I just wondered if anyone knows why the issue is happening, and how to stop it from happening.  I think that's the 4th time at least that I've said that; not sure why it's being ignored.

Edit:  As a test, I deleted the count-in (the four stick hits); not the measure, not the CCs or anything, just the notes (G2 x4). Exported it to WAV, and it played with no volume fluctuation.  I half expected the first few beats to be super loud, but no, it was fine.  When I put those notes back in, the problem comes back.
 
So what I'm reading here is you deleted the count in midi notes,, but after you export there is still a count in? Correct?
If so,  it must be as I said in post #4. Your metronome must be exporting. If there is a metronome buss delete it or turn the volume off. That would explain the double volume. 
 
I know what you mean about 200 songs. I just updated most of my tracks which was over 100 songs for now. There are more but Summer is here so they will have to wait.
You should think about doing what I do and Master all my tracks in a wave editor. That way they are all the same volume and things like beginnings and endings are also dealt with.  

If the count-in is mixed into your songs, you are not going to be able to edit 200 songs at the same time.

I suggest, in the future, you paste an audio count-in measure ahead of your song on a separate track, and route it to its own bus, before sending to the Master Bus. You should then be able to set the output to whatever level you like on the sub bus.

In case you are already sending to a separate bus, make sure you are not outputting directly to your audio interface and that you are routing the sub bus to the Master Bus along with the rest of your audio.

When you mix down, you only want the Master Bus as your source. The mix should sound exactly like what you are hearing.

Cactus Music
Edit:  As a test, I deleted the count-in (the four stick hits); not the measure, not the CCs or anything, just the notes (G2 x4). Exported it to WAV, and it played with no volume fluctuation.  I half expected the first few beats to be super loud, but no, it was fine.  When I put those notes back in, the problem comes back.
 
So what I'm reading here is you deleted the count in midi notes,, but after you export there is still a count in? Correct?

No, when I delete the count-in MIDI notes, there is no count-in at all (because the notes aren't there anymore), the song simply starts without a count-in.  Yet, the volume issue goes away as well, which is weird.  And when I put the notes back, they are way too loud.  It happens on every song.
 
I posted a satisfactory (for now) workaround in my post above.  Since that works, the metronome can't be a factor.
 
 

Cactus Music 
You should think about doing what I do and Master all my tracks in a wave editor. That way they are all the same volume and things like beginnings and endings are also dealt with.  

 
Good idea, thanks.

Musicman762
If the count-in is mixed into your songs, you are not going to be able to edit 200 songs at the same time.

Yes, I keep saying in my posts that editing 200 songs all at once is NOT my goal.
 

Musicman762
I suggest, in the future, you paste an audio count-in measure ahead of your song on a separate track, and route it to its own bus, before sending to the Master Bus. You should then be able to set the output to whatever level you like on the sub bus.

Count-ins vary between 4-8 beats, or 3-6, etc., depending on time sigs and all.  But I understand what you're saying.  My workaround mentioned in an earlier post will work for the time being, but I'll remember your suggestion for the future.

OK, so this is weird, The song sounds perfectly correct when played in Sonar, but after the export the Wave file version count in is obviously way louder? That's technically seems impossible. 
 
Just to trouble shoot.
Which drum VST are you using?
I would try inserting a different drum VST and put the count in on it's own track assigned to this and see if it still happens. 

Cactus Music
OK, so this is weird, The song sounds perfectly correct when played in Sonar, but after the export the Wave file version count in is obviously way louder? That's technically seems impossible. 

That's exactly what happens; and yes, it is on the bizarro side.
 

Cactus Music 
Just to trouble shoot.
Which drum VST are you using?
I would try inserting a different drum VST and put the count in on it's own track assigned to this and see if it still happens. 

 
Using the Roland SCVA for drums (and all other instruments).  Will try your suggestion and see how it goes.  But man... no matter which way I slice it, I'm gonna have to edit 200 songs... :-\

Just to be clear the Roland is a external sound module? As in Sound Canvas? 

It's the Sound Canvas in VST form.
 
I can either start the drums at a lower CC7 value, then change it immediately after the count-in;
or simply lower the velocities of the count-in notes.  Those are the only two options I can see right now.

If you change the Sound Canvas instrument for the drums to a sound that is not drums and export does the issue still happen?