Since every FM oscillator includes its own envelope, you can now manipulate the intensity of the frequency modulation over time-and thus, change the timbre-by adjusting the shape of the modulator envelope. This approach is the essence of FM synthesis. As you raise this level, you’ll hear a dramatic harmonic shift in the sound as the frequency modulation for all three carriers becomes more pronounced. Next, slowly raise the level of oscillator D to around -15dB. This will give you an organ-like sound consisting of three octaves. Set all oscillators to sine waves and tune the three carriers to 1, 2, and 4. Here’s a simple technique that will get you started with the “triple” FM algorithm above.
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