Spectral analysis and sinoidial extraction

Hi,
I want to dive into additive synthesis. And for this I’m searching for a tool to do spectral analysis on audio samples. With sinoidial extracion. Need not to be fully automatically. I know there was Lemur, but that was 20 years ago!
Does anyone know of some nice tools for this?

Supercollider has extension ugens for working with .ats files (AtsFile, AtsSynth etc.)

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