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@BringMeMyFix
They're all loud at certain speed (resonant frequencies of turbo, room, etc), but the fluid ones are usually quieter than the rest.
The fact that there's constant resistance and minimal flywheel effect will be a shock to your knees. Go easy to start with, and make sure your cadence isn't too grindy (eg >90rpm). Once adapted, you can do the grindy sesssions (which turbos are particularly suited to).
Also, the bike is static in the vertical plane (I think that's right), so again, there's some adaptation compared to riding on the road where the frame gives a little more, and you instinctively do more work with the glutes.
Have you lifted the front wheel an inch or so (riser block or book/directory/catalogue/etc)? That may also help to lessen the vibrations/noise.