Removing Frequencies from a Signal - FFT?

I have created a pretty elaborate SynthDef, I love how it sounds, but there is some unwanted noise as a side-effect. I would like to remove this noise. The noise is in the higher frequency spectrum. Whenever I try to use a filter, it doesn’t eliminate this unwanted noise, it just ‘dampens’ the unwanted noise. Could I use some FFT UGen to remove this noise?

You can try PV_BinGap from miSCellaneous_lib, also PV_BinPeakEQ that I’ve suggested recently.

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Thanks! It seems I was looking for the PV_BinGap