HELP! Weird "Underwater" effect when reducing high and low frequency noise.

Hi everyone.
I am in a spot of bother with Soundtrack Pro. I hooked up a reel-to-reel player's audio line out to my PowerBook's line in. Then in Soundtrack Pro, I hit record.
So everything works out fine, except...
There is some hissing in the audio file which I can easily remove with the "Reduce Noise..." feature, but there is this low "rumbling" noise in the background. When I try to remove that, the entire song sounds like it was played "underwater". I tried selecting only the low noise, goin to "Process>Set Noise Print" then reducing the noise, and the underwater effect gets worse.
I need help pronto!
Thanks

Hmmm...OK. The hiss is removed, and the underwater effect is elimanated, but how do I get rid of this annoying low rumbling? I tried looking under the Analysis tab and selecting "Power Line Hum" but it couldn't find anything. High Pass Filter and Linear Phase EQ either kill the whole bass frequencies or they make the song sound "Tinny".
Any advise?
Thanks

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