Audio is half art, half science. That's why I'd try to find someone with experience.
Back in university, I heard lectures on FFT and its applications to audio signal processing. So open access university courses would be the second place I'd look. The approach I always try first is to ask people I know if they can recommend a conference/meetup. For example, the annual JUCE events appear to be chock full with VST plugin developers. There's also private schools like SAE where you (or your employer) can pay for you to have an hour with one of their lecturers to ask questions.
Back in university, I heard lectures on FFT and its applications to audio signal processing. So open access university courses would be the second place I'd look. The approach I always try first is to ask people I know if they can recommend a conference/meetup. For example, the annual JUCE events appear to be chock full with VST plugin developers. There's also private schools like SAE where you (or your employer) can pay for you to have an hour with one of their lecturers to ask questions.