Parameter is the fancy name given to any value or property or control of a synthesizer module that you’re trying to change. For example, an oscillator’s parameters typically include its pitch and the width of its pulse wave. A filter’s parameter will include its cutoff frequency (pitch), the amount of resonance (feedback), and possibly other controls such as a blend between its different outputs. Parameter was a popular term to describe a value you could change in software, and it’s been carried over by some to hardware modular synths.
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