Splitting vocals from .wav file

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I am trying to take a .wav file and extract the vocals from it. I want to use the vocals to move the mouth of something to sing along to a song. I tried spleeter, but I am doing this on a raspberry pi zero and spleeter was giving me a message that I don't have enough RAM. Is there a good light weight option for this? Library or API? The vocal quality doesn't need to be great. I won't be playing the audio, only analyzing it.