Tips for working on bad VHS audio?

I have been working on a VHS transfer for a client, with clips that are extremely hissy. These clips may even be second gen copies, but I'm not exactly sure of the lineage.
I have been trying to reduce the hiss as much as possible in STP2, but am not getting the best results. I can greatly decrease the hiss using the noise reduction, but lose a good chunk of the vocal frequency. The results are either too low or too high for the vocals, almost muddy sounding.
Using the Expander - High Expansion preset helps after the noise reduction, but I'm not familiar enough with the tool to do too much with it. The GraphicEQ tool also helps restore the voice, without the hiss, but it takes a lot of guessing on my part.
I was curious if anyone had any tips or suggestions for working with old, hissy VHS audio in STP, or on how to make better use of the STP tools.

thank's
John sebastien; webmaster du site sur la médecine et notament l'article lait bébé.

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