| What do you mean by "string growl"?
Are you getting a buzzing sound, like the string vibrating against the frets?
If so, your neck may be too tight (buzzing between your fretting finger and the headstock), too loose (buzzing between your fretting finger and the bridge), and/or your strings are too low.
If you're not familiar with how to setup a bass (adjusting the truss rod, saddle height, intonation etc), see if there's a local luthier who can help you. Or you can read about it online (many resources, too numerous to mention).
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