An expressive feature of subtractive synthesis is...
- the filtering properties -- pitch, volume, and space -- can vary over time.
Pitch is a perceptual characteristics, not a physical property. - the subtractive properties -- pitch, volume, and space -- can vary over time.
There is no such thing as 'subtractive properties'. - the subtractive properties -- frequency, amplitude, and phase -- can vary over time.
There is no such thing as 'subtractive properties'. - the filtering properties -- frequency, amplitude, and phase -- can vary over time.
Good job!