FWIW one quick way IME to diagnose noise coming from loose/old belts is to take a garden hose and aim it toward the belts for half a second while the engine is running. If the noise goes away then comes back over a couple of seconds it's likely the belts.
Tip: do not stand by the front fenders...
Geez, my hearing must be off, all I perceive is what sounds like an electronic hum or whine, nothing like bad/slipping belts IME.
Can the OP get another sound clip closer to the engine?
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