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It's likely the belts are still talking, but you never know.
You need to isolate this sound. The simplest way I've found is to aim a fine stream of water (like from a plant mister) at the various belts and pulleys until the sound goes away, or at least changes. You'll be amazed how well this works. You can even try shooting a little just behind the compressor pulley in case the A/C clutch is the source of the noise.
I'd be willing to bet a warm Guinness that when you tightened the belts you've forced the pulleys to be more misaligned with the fan and crank pulleys. You can check this with a straight edge. This happens because the rubber bushings used in the alt, p/s and compressor mounting brackets are easily compressed when they get old. Easing off on the belt tension may help a bit, but then you're inviting more belt slip so the proper remedy is to replace those bushings. Belt dressing is at best usually just a temporary solution. The bushings are all the same size so just count how many you need. I've found the alternator is usually the first to have the mounting bushing problem, but if you plan on keeping the car for awhile you're best to do them all. If you're planning on selling the car tomorrow then you can try rotating the existing mounting bushings and shimming the mounting bracket until the pulleys are re-aligned.
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