Linear Control/Modulation of Oscillator Frequency

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Is it possible to control the frequency of any of the audio generators on a linear or absolute scale? The MIDI note pitch varies logarithmically so even if I work out the appropriate MIDI notes to get my waveform to play at a given frequency, modulating the pitch (I mean like tremolo amounts, not FM synthesis amounts) will scale very differently at different frequencies.

For context, I'm working on formant synthesis.

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The modulation mapper is often the answer here - convert to a modulator, pass the value through the mapper to apply the appropriate curve, convert back to whatever format you want. Something like "Symetric" with intensity -2? As I don't understand either the maths of what you're doing or what the curves do, I can't be sure :D.

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