control room sound effects

Figure 2 summary

• 3 oscillators in simple FM
• 4 random values
• base offset
• sum 2 oscillators
• random scaling
• random offset
• input to FM oscillator

Four control signals

There are 4 randomly moving values used to make this sound. The first two are frequencies for a pair of sine wave oscillators, as in the last patch. This time we set the minimum frequency of both oscillators to 20Hz. The scale the sum is multipied by a random amount of 500, then its base is shifted up when added to a new random up to 3000. This is used as the frequency input to a third oscillator.

Sound effect

A waveform moves in frequency over a range of 3000Hz, but at the same time its harmonics vary wildly. Modulation performs another kind of fusion on sine waves, it causes one wave to "carry" another. In this example we seem to hear one very complex source whose properties are changing rapidly rather than two or three distinct components.

Figure 2: fmsfx

B-fmsfx.ogg B-fmsfx.pd