- Modulation is the technique of setting parameters to sound generators and sound modifiers statically.
Modulation is about _over time_, not about setting statically.
- Modulation is an oscillator with a frequency below the human range of hearing.
That is a low frequency oscillator.
- Modulation is the technique of varying parameters to sound generators and sound modifiers over time.
- Modulation reduces the proportion of the amplitude over a threshold amplitude.
That is a compressor.