Can I remove the voice from a sound track, completely?

No, you cannot fully remove the voice from a track, but WavePad can help lower the voice.
By going into Effects-->Special Effects-->Reduce Vocals this will allow you do reduce the vocals.

WavePad will attempt to identify the voice in the left-to-right spectrum of a stereo recording and remove it. The recording must be in stereo (from an original stereo source like a CD - simply converting a file to stereo will not work). It will also remove any instruments near the voice in the stereo spectrum.

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