Normalizing Volume for Music Already On Ipod (Soundcheck)

Hello,

I did some research and couldn't find a solution for this. I've got about 5000 songs on my ipod that were not tagged by itunes for soundcheck, so if i turn on soundcheck it doesn't impact their playback volume. Is there a way to update the volume information for music that is already on your ipod. it seems like itunes will only scan the files in your itunes library on your computer and I'd rather not put all the music back on my computer and then back on the ipod....any suggestions?

Thanks so much!

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