there are 2 posible things. i already experience both. either one belt is too tight or lose and the other is under the car, the big belt needs to be adjusted while the engine is running, this is what fix my sound. under the engine the big belt there is a bolt that needs to be lose more most likely but this is done while the engine is running " you are not touching the belt". this happen when the mechanic puts too much force and tight the bolt too hard. i wish i had taken pics when they fix mine. the bolt is exactly next to the big belt under driver side, is very easy to do. i hope this ur problem and this is the fix. if u show me a picture i can point out exactly what to touch and do. many machanics dont know about this, it took me 3 shops until finally got someone with lots of experience in accords.

bubbu u should trade me ur music for my stock ones