This video is showing the Klanghelm VU meter, but I am interested in the method used for gain changes in the clip. Can I get close using Sonar? Look at around 6:44 into the video to see it.
https://www.youtube.com/watch?v=Px-r3HHV6aA
thanks!

This is pretty much exactly how Sonar does clip gains. In what practical sense is it currently different than what you've been doing? 

Watch this video for a really cool way to adjust Clip Gain in SONAR that no one seems to know about...
 

 
Although the following is a specialized use case involving a different application, it seemed appropriate to mention that if you're working with beats, you can do precise clip gain changes easily in the loop construction window.
 

The main thing I don't like about Sonar's clip gain envelopes is that it only goes up by 6dB. Or perhaps I'm an idiot as usual and I missed a preference somewhere. ProTools goes up something like 36dB. Not sure that I'd ever need that much but 6dB can be limiting. 

I think the assumption is if your audio needs 36 dB of gain, you'd want to bring the level up before doing automation.
 
But -  note I added a video to my post above (the one with the loop construction window option) about a different way to do really fast, multiple clip gain automation adjustments. Are you familiar with this technique? It's a huge time-saver. 

I think that first part is a bit of a cop-out :) 
I get where you're coming from and obviously there are easy ways to work around it, but you can't pretend you've never had a situation where it wouldn't be quicker if you could extend the envelope to 9 or 12dB. But that's something for the feature request forum. 
 
Thanks for the video, I'll check it out.

Anderton
I think the assumption is if your audio needs 36 dB of gain, you'd want to bring the level up before doing automation.
 
But -  note I added a video to my post above (the one with the loop construction window option) about a different way to do really fast, multiple clip gain automation adjustments. Are you familiar with this technique? It's a huge time-saver. 

But occasionally you're working with a clip that is too low in gain to be corrected with the envelope method you showed above (which I use all the time).
 
In that case, I use Process | Apply Effect | Gain. That works fine, but it would be nice if there were a more direct way to get it done. SONAR (or maybe pre-SONAR Cakewalk Pro Audio) clips used to have a little gain button on the corner that would turn the whole clip up or down.

That's still the way PT works I think. 

Mr Anderton: I'll check it out.
what I saw in the video was the user picking an area and then adjusting the gain. No Nodes, and the waveform display shrunk or grew as the gain was changed. Seemed smooth and easy that way......

Sanderxpander
I think that first part is a bit of a cop-out :) 
I get where you're coming from and obviously there are easy ways to work around it, but you can't pretend you've never had a situation where it wouldn't be quicker if you could extend the envelope to 9 or 12dB.

 
Actually...no, I've never felt the need to go above 6 dB, and many times I use clip gain more to attenuate than amplify. The reason is that by the time I've gotten to the automation stage, the levels among the clips are pretty consistent so automation is about tweaking levels, not adding lots of gain or attenuation.
 
Standard disclaimer of "This is not to negate that some people would benefit from this function and I am not saying that SONAR is perfect" but I have no need for more gain that what clip automation currently offers, and even then, I rarely need 6 dB.