Processing a low-quality acapella extracted through an AI acapella extractor can be a challenging task, but there are a few things you can try to improve the quality of the audio with a free DAW and free audio plugins:

EQ: Use an equalizer to remove unwanted frequencies that may be present in the acapella, such as background noise or hum.

Compression: Apply compression to even out the volume of the acapella, which can help bring out more details in the vocals.

Noise reduction: Use a noise reduction plugin or tool to remove background noise and hiss from the acapella.

Reverb: Add a small amount of reverb to the acapella to help it sit better in a mix and give it a more natural sound.

Harmonic Excitement: Use harmonic excitement plugins like exciter or saturation to add harmonics to the vocal that are lost in the extraction process.

Volume automation: Use volume automation to even out the levels in the acapella and remove any sudden jumps or drops in volume.

Pitch correction: Use pitch correction tools to correct any pitch issues in the vocals.

It's important to keep in mind that no amount of processing can fully restore a low-quality acapella, but these techniques can help improve its sound quality and make it more usable in a mix. It may also be helpful to experiment with different processing techniques to see what works best for your particular acapella.
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