Real Time Stretching ???

I'm with Rick on this -in AE, you select an Audio Asset in either the Project Panel or the Timeline; then goto the Edit Menu and select Edit in Adobe Audition. Adobe Audition will startup, if it hasn't already, and it will load the uadio file. This tutorial should be sufficient your for needs - https://youtu.be/F5s_pyM3pYA

- hopefully! 🙂

• AE and Audio = very basic
• Premiere Pro and Audio = better but Dolby 5, surround, and a bunch of other critical mixing tools not available, but still sufficient for most productions that do not rely on cinema-quality mixing
• Audition = Just about anything that you need to do full cinema quality mixing and sound effects as long as you have the audio equipment available in your room to hear everything you should be hearing when you do that kind of mix. You can't do a mix like that justice using the speakers on your laptop or even a good noise-canceling headset. 

All 3 apps can use Dynamic link to process audio and video. 

Unfortunately, there's no "Maintain Audio Pitch" option on the After Effects side.

I copy and paste clips to Premiere Pro frequently to retime them to take advantage of how Premiere Pro automatically extends the Clip Boundary as well as the Maintain Audio Pitch that's in the Clip Speed / Duration dialog box; however, while the return copy and paste brings the speed change over, the Maintain Audio Pitch falls off.  I've gotten aroung this by doing an Audio Only export of an AIF or WAV on the PR side and then importing and syncing that back up with the retimed source footage in AE.

I've tried using Replace Footage with After Effcts Compostion for the return, but the audio remains with the pitch adjustment maintianed remains in the PR Timeline.

Despite the lack of being able to maintain audio pitch, one could make a very strong arugment that After Effects has "better than real time stretching" now that it inlcudes what used to be called "Kronos" by the Foundry under Effect > Time > Timewarp.  Also, there's Pixel Motion as well.  Each of thosre are very hard to beat.

-Warren

No, After Effects has no ability built in to preserve audio pitch when time stretching.

Premiere Pro does, or you can do even better quality pitch processing in Audition.