As far as I can tell, it should work the same way as gradually changing pitch. On Adobe Audition CS6 on a Mac, gradually changing pitch is as simple as using the Time and Pitch > "Time and Stretch (process)" under the Effects menu, then switching from the iZotope plugin to the Audition plugin, and adjusting the beginning pitch and final pitch over the selected audio. Why doesn't this work with the time? I'm trying to slow down a piece of audio gradually, but it doesn't seem to work.
You could possibly try Waves Doppler or even
And another FX plugin that does tapestop:
I was able to stretch it, then draw attention away from the fact that it had not stretched gradually by simply gradually lowering the pitch. It worked somewhat well, but it was not perfect. Waves Doppler is very tricky, I am still trying to figure out how to get it to work right. Meanwhile, I worry as to whether or not plugins will maintain the 192kHz 64-bit quality WAV files I am working with, but I will give the second plugin you suggested a shot since it mentioned 64-bit online, then I'll try the first one.
There are a few ways to slow a portion of a track down. Use Effects > Time & Pitch > Stretch and PItch (process). If you choose the Audition algorithm, you can perform a gliding stretch which will let you stretch from 100% (normal playback) up to 800% (8x slower) over time.
If you're using Audition CC, the Pitch Bender effect will allow you to keyframe the slowdown on screen so you can draw the curve and duration you want directly on the waveform.
Also, I question whether your WAV files are actually 64-bit, but the bit rate of an audio file is not the same as the bits of a CPU or OS. All Audition's native effects work with 192kHz audio files and on audio files of any bit rate.
The Doppler Effect is actually coming out quite nicely now. I can just layer it on pieces of audio ever closer to the end, for example, to get a full drop-off of sound, particularly in the bass, or pump beats in and out. The plugins are doing excellent as well, so I'll have a full array of different options to present. Hopefully a consenus can be reached as to what effects to go with. Thanks for everything guys! If you ever find that "Cutting Power" preset, let me know, I'd love to try it and add it to the list.
My files edit in CS6 on my Mac at 32 bit, then I output them as 64 bit, or I convert files to 64 bit, then begin work on them, so yes I am speaking as to my files, not my CPU, but thanks for checking. Meanwhile, the time stretch process I detailed in my original statement above isn't working properly; it doesn't apply gradually, and yes I am adjusting it in the Audition preset, not the iZotope. I obviously need to upgrade to CC, I didn't know it came with Pitch Bender native. Thanks!