Why does a gas regulator make a whistle noise when being used?

The gas regulator (on bbq grill) makes a whistle noise.Can this be a simple repair by me or a professional.What causes this noise?

Answers:
it's the gas moving over the diaphram - thre's no way to fix it. You'd have to replace it. It isn't failing though, so it's not hurting anything.

Other answers:
It ain't broke, don't fix it
It ain't broke, don't fix it
The gas passing through the orifice makes the noise. Sometimes turning the pressure screw 1 turn higher or lower may stop it.
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