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You can't control the volume of the artificial exhaust sounds. It's controlled by a module and everything is predefined. All you can do is turn it off by pulling power to the module or coding it off.
Edit: Not sure if this is still possible, but when the active sound system came out, you could pick different profiles (different engines/cars) from BMW's line up when coding it!
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Current: MB 21 X5 M Comp | '20 Z4 M40i
Past: 09 M3 Coupe DCT (sold) | 11 1M Coupe MT (sold) | 15 i3 REX (returned) | 15 X3 35xi (sold) | 16 M235xi Vert (returned) | 18 M3 Comp Ultimate DCT (sold) | MW 20 X5 M Comp (totalled)
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