swift - AKOscillator frequency range for theremin sound in iOS

Question

I want to create similar sound to theremin using touch coordinate on screen. I'm using y axis as frequency, x axis as amplitude.

Due to my small research I believe I can create it using AKOscillator or AKFMOscillator from AudioKit framework (please let me know if any other oscillator works better in this case). I'm open to other frameworks like built-in AudioToolbox (MIDINoteMessage etc.) if I can create similar sound to theremin.

Here it says theremin has two oscillators. One with fixed-frequency on 260kHz and one is dynamic between 257-260kHz. It superimposes their output (it takes difference of them I guess?). And it outputs between frequency between 0-3 kHz. When I create sounds using AKFMOscillator with baseFrequency between 257-260 kHz, it sounds high-pitched. When I try with one oscillator range between 0-3kHz it sounds very robotic. How I can simulate timbre of theremin?

How can I make it sound better? Should I mix two oscillators? I tried mixing with AKMixer but when both oscillators use same frequency and amplitude, it makes no difference. I tried to mapping to nearest note (auto-tune), I tried limiting the frequency between 3-4 octaves. It sounds better but still not good as theremin. What should use ( AKOscillator or AKFMOscillator, OscillatorBank), with which parameters (rampDuration, baseFrequency, modulationIndex, amplitude) to simulate more thereminish sound?

Update: I did some more research and played with Synth One presets. Now, I know I need two oscillators mixed (both set to saw-shape wave). Changing ADSR(envelope) values to specific ranges creates richer sound (this gives the instrumental sound type). And a lfo to create the wavy (or spooky) sound effect. Playing notes (specific frequencies) creates good sounds, if you play every frequency in between note frequencies it doesn't sound good.

question from:https://stackoverflow.com/questions/65643202/akoscillator-frequency-range-for-theremin-sound-in-ios

Answer 1

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