When working with low-quality acapellas extracted through an AI acapella extractor in a DAW, there are several VSTs you can use to improve the quality:

- Melodyne: This pitch correction tool allows you to adjust the pitch and timing of individual notes within an audio file, which can be useful for fixing any pitch issues in the acapella.
- RX7 Standard or Advanced: This noise reduction tool has a wide variety of modules that can help you remove unwanted noise and artifacts from the extracted acapella, such as hum, hiss, and crackle.
- FabFilter Pro-Q: This equalization tool allows you to shape the frequency response of an audio file with precision. You can use it to bring out the vocal frequencies and reduce any unwanted frequencies that may be present in the acapella.
- Waves Vocal Rider: This dynamic processing tool can help you even out the levels of the acapella, making it easier to blend with the instrumental track.
- Reverb plugins: Depending on the sound you're going for, you may want to use a reverb plugin to add some ambience to the acapella and help it blend with the instrumental track.

It's important to experiment with different combinations of plugins and techniques to find what works best for your specific situation.
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