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the short answer is, no you can't.
The long answer is, no, REALLY, you can't.
It's possible to do it on a tracked editor WHEN you have the original pre-mix tracks available to you. i.e. you have the vocal track, the drum track, the guitar track, etc. Just mute the vocal track.
Your problem is that you're using a MIXED source, where all the tracks have been smooshed together to make one soundwave. At that point, it's kind of like trying to unmix the eggs from a cake batter. It might be possible if you spent thousands of years deconstructing it on a molecular level, but realistically it's just not gonna happen.
The way CEP (btw, that program is powerful but the interface sucks. Try Sonic Foundry's SoundForge) and all other programs work when you're trying to remove a sound is that you tell it a specific frequency range to mute. This works really well when, say, you're trying to get the hum of an air conditioner out of a vocal track because the air conditioner hum is a constant (and narrow) frequency and can therefore be removed with minimal damage to the vocal track.
You're trying to remove something that continually changes frequencies, and in fact will often match the frequency of something in the background. The end result of a LOT of work might be that you get rid of the vocals, but you'll have big gaps in the instrumentals as well.
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