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It's the age old question of impossibility! You cannot extract clean vocals from a song full of music. It's like trying to extract the milk from your pancake batter. You Can however try to EQ out some of the frequencies and deal with the leftover instrumentation. Sometimes it works and sometimes it doesn't.
you want to avoid applying normalize or compression effects -anything that changes the amplitued of the sound really- more than once if possible. just normalizing once at the end insted of twice etc reduces the nasty things that happen to your audio because of trunkation. should proberbly dither before saving too.
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