I'm not following. When you ramp video from one speed to another, there are 3 sections that matter:
-The initial speed (e.g. 100%)
-The re-mapped, ramped part (e.g. ramp from 100% to 10%)
-The speed held at the different date (e.g. 10%)
If you are working with just a piece of the audio in the re-mapped/ramped portion, how would the rate stretch tool emulate the ramping? The rate stretch tool doesn't ramp, it changes speed equally across a clip.
You can easily cut the audio at the key frames and take care of part 1 and 3 using "Speed/Duration..." (e.g. 100% on one, 10% on the other), but again the rate stretch tool does not ramp, it merely changes speed/duration.
What am I missing?