This Vocal Removal technique can be effective, if the vocals are in the centre of a stereo track (common in pop music tracks). It removes what is common to both tracks (i.e. the vocals), leaving behind what is different (i.e. the instrumentals).
Download Audacity (Win/Mac/Linux) Free
To save as mp3 you need to have
lame mp3 encoder installed
Disclaimer: This method may grab more than vocals in some cases.
Alternative method:
Save to one track at the end. Reduce the audio volume with amplify to make the softest parts disappear then increase it again.
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