Short of getting fancier noise diagnostic equipment (chasssis ears, freq. or spectrum analyzers) I think you’ve gone as far as you can go. It is a wheel or driveline noise, most likely in the left front. Wheel bearings are more likely than diff bearings, because of the loading and environment. The double-row wheel ball bearing doesn’t get louder on turns if it hasn’t failed, it just gets drony as it wears. Because your car is ca. 20 years old anyway, I would replace the wheel bearing.
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Prost!
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