Retaining High Frequencies when Varispeeding

Question

Aside from recording at 192kHz with the highest quality mics and recorders, how do you reinvigorate your slowed down/varispeeded sounds after they've lost most (or all) of their airy top end? (Varispeed, meaning slowing down playback in Soundminer, or using Pitch n' Time in Varispeed mode.) This effect is über-bad with older recordings or material from CD libraries. I find myself reaching for a basic EQ at times like this, boosting with a high-shelf from 5khz and up. What are your techniques?

CLARIFICATION:

Original question asked how to retain high frequencies when pitching down a file, rather than slowing down a file, thus the earlier answers.

Answer 1

This might just be a crazy idea on my part (because I've never tried it), but why not try using some of the high end content from the original, non-pitch shifted, file?

It might take a little experimentation and filtering, but it could add back in what it's losing.

For Varispeed/Pitch-n-Time: What if you copied the file and pitched it up (just a simple pitch shift). Then used varispeed on both the original and your pitched up copy? Then use previous idea.

Another trick I should have mentioned is MaxxBass by Waves. It uses perceptual encoding to add harmonics to bass heavy content. If you have that plugin, it may be an option.

Answer 2

It's rare I would use solely a pitched down sound on it's own, so high frequent content comes from other layers in a composite sound...

Answer 3

Duplicate your track, and high pass all the top end you want to keep on one track while you pitch-shift the other one, possibly lowpassing out all the shifted top end. Basically, all you're doing is separating the track like a zipper.