PS: What does HUD stand for?
Heads-Up Display. It tends to be used to describe a graphical interface overlay, derived from those in fighter jets.
Can anyone comment on the gain envelope options?
You should take a look at our Volume Envelope effect (Effects->Amplitude and Compression->Volume Envelope). I think it should provide the functionality you're looking for - it gives you the abilty to basically draw and apply a gain envelope to a selection in the wave editor - same as in Au3, though a bit more powerful in some subtle ways. You can also save a preset / favorite for any envelope if you want to, for example, have one keystroke to quickly duck a loud section of audio.
Does this match what you're used to in Peak / Wave Editor?
Also - take a look at Preferences->Data - Audition automatically does a tiny bit of cross-fading at the boundaries of edits, to prevent clicks. By default, it's set to something around 2 ms, but the max values are quite high, so if you were doing work where you wanted to use the hud to quickly turn up and down audio all over your file, but wanted smoother crossfades, you could try adjusting these settings also.
These volume envelopes are pretty much what I was talking about.... yes.
The handles and adjustments are a little finicky but I'll try some more tonight.
After a little experimentation..... WE HAVE A WINNER!
This method (although a few mouse clicks away) does what I was talking about.
I guess I wonder why the same volume change options that are available in the Multitrack view, aren't simply available in the Waveform view?
It really would be nice to apply gain changes to one channel of a stereo file for instance.
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"It really would be nice to apply gain changes to one channel of a stereo file for instance."
Just disable editing on the channel you do not want the gain changes on. In the Editor, on the right hand side you will see button to enable and disable editing of the channels. When a channel is disabled it will turn gray.