Hi-pitched noise on slowed down audio track

I'd like to increase the levels on an audio track that I've slowed down to 50% but I am prohibited from doing so because of a resultant hi-pitched background noise that seems to occur due to the speed change. I tried using a couple of the FCP audio filters (the ones for 'hum remover' and 'high pass filter') - does anyone have any suggestions for this problem? Using FCP 5.0.4.
Any help would be greatly appreciated!

Jim,
Thanks for pointing out that filters could be applied prior to the speed change. I did just try out your possible solution, using both of the filters that I previously mentioned, but the problem remains.
Again - thanks for offering a solution though.

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clear answer.
If I record an audio track (or a few audio tracks),
am I able to manipulate the tempo to what I want--ie,
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Thanks for the help!
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Thanks for the advise on this. I will explain a little more what am have/am intending to do.
I have used Audacity to slow the song down (Effect>Change Tempo)
Audacity will allow me slow the original song down by up to 99% (Or anything in-between up to 3 decimal places)
Unfortunately I am working to a time restraint of 12 minutes per clip (as my DSLR will only allow up to a 12 minute clip).
The song at normal speed is 4 minutes long.
Originally I slowed the audio down by 50% (Making the audio 8 minutes long), lip synced to it using a rasta blaster and recorded the video using my DSLR at 720p 50fps.
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(You can ignore the 65% slowed down audio I mentioned earlier if you like, that was just an example of a slower than 50% audio test)
Firstly what I really want to do is to be able to slow the AUDIO down as much as possible (But still within the restraints of only being able to adjust FCPX retiming within a whole 1 percentage in the final video edit), but have the AUDIO of the song as near to/under 12 minutes as possible.
I will then re-record the video again to this new slowed down audio.
Secondly I will speed up the video from 12 minutes to 4 minutes.
Thirdly I will layer the correct 100% Normal AUDIO on top.
The FINISHED video should then look like everyone is wizzing around at high speed but the guitar playing/lyrics look like they are being played/sung at the normal speed.
Whatever happens (due to the constraints of FCPX) I need the calculations to work so that FCPX is retimed exactly to a whole 1% for the final video to sync up correctly.
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What calculation do I use to work out the percentage to slow a 4 minute song down to a 12 minute song?
What calculation do I use to work out the percentage of how much I need to then speed the 12 minute video up to turn it back into a 4 minute video?
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