Using the Spot Healing Brush Tool tends to leave holes that are quieter than the surrounding audio, which is rarely what we'd want. The only time the tool truly works well is if you've recorded audio in a perfect environment with no audible noise floor. That's not how the real world typically works, though.

Just to visualize what I mean, try this:
- Effects > Generate > Noise and Apply
- Use the Spot Healing Brush Tool above the 1.5k range
- notice that you're leaving holes of quietness behind wherever you paint

It would be incredible if the algorithm paid more attention to the amplitude of surrounding audio and didn't leave such noticeable visible/audible gaps behind!

The current workaround is to use the Paintbrush Selection Tool with a low opacity (50) and use Auto Heal instead. But that's an extra step that I wouldn't have to do if the Spot Healing Brush Tool was enhanced.

Premiere Pro has a few different audio crossfades: Constant Power (the default), Constant Gain, and Exponential Fade.

The algorithm used to crossfade audio in Audition's "Mix Paste" seems similar to Constant Gain, but it would be much more useful to us if we could get something closer to Constant Power

Steps to hear how this issue affects audio:

1. Open a file with consistent noise (ambient room tone, waterfall; any noise that has mostly consistent amplitude throughout) or create a new file and generate some noise
2. Copy a portion of the noise
3. Mix paste this copied noise atop a different section of the same file with a crossfade duration (somewhere between 0.2 and 0.6s for this example would be best)
4. Notice the dips in amplitude during this crossfade

Bringing this same noise file into Premiere Pro and following the same steps, but using Constant Power fades, you shouldn't be able to detect any change in audio amplitude.

This current mix paste crossfade result makes this feature significantly less useful for me and my team because of those unnatural, unwanted dips in volume/amplitude.