Are you sure the buzz is from AC power and not unshielded, unbalanced or bad cabling? Have you ruled out RF interference?

Your buzz problem will not be fixed by a power conditioner. Track down and fix the buzz first as jg49 suggested, then consider a power conditioner for doing what it is designed to do - suppressing power spikes and surges.

I agree with with what was said above about your noise problem. But it is still worth doing a search on "power conditioner UPS" (match all words). There have been several long threads on the various levels of power conditioners and uninterrupted power supplies and what you get for your money at various levels.

Make that three....do your homework and see what causes the buzz. If it proves to be ground loop, you may need a isolation XFMR.