if you are bored…
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StateVariableFilter with Peak filter (LP-HP, this is just a 3 minute job)
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ramped frequencies should be logarithmic (just a multiplication instead addition) -> LogSmoothedValue
https://forum.juce.com/t/request-dsp-oscillator-should-use-a-log-frequency-fade/25286
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intersample (variable) delay with high quality interpolation (for chorus/phaser)
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pink/white/brown noise generator
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aliasing free (band-limited) Oscillator
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bias optimisation
https://forum.juce.com/t/request-dsp-bias-optimisation/25287/1