Try removing the TL022 chip. It will eliminate your ability to control the manipulate the oscillation noise with the speed knob, but does that also make the noise go away?
Do you have any other dual op amps handy? If so, try replacing the TL022 with another dual op amp. It doesn't have to be a TL022. Other chips like 4558, TL072, LM358, et als., will work. They just don't work quite as well as the TL022.
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