If it's happening while you are sitting still, it's probably the pump (my guess would be a pressure bypass doing what it's supposed to do, not cavitation, but I'm no expert). If it's happening while you are rolling, it's probably the tires.
If it's the pump, just don't turn the wheel to either extreme. If it's the tires, not much you can do but get quieter tires.
Many ppl, including myself, have quite a bit of tire noise when making very sharp turns at slow speed. It's normal, just annoying.
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