i'm working on a sampler that uses a simple equation system to determine parameters of reverb, volume and pitch filtering. The goal is to emulate 'depth' using the idea that if a sound's source moves away from our ears, we will perceive it as quieter and more diffused, with its high-pitch content less present.
Motivated by this, I started to read about the biquad ugen, but i haven't figured out how to deal with its coefficients so I can make something interesting out of it.
My question is, how can i make a high cut filter that gradually reduces the high-pitched content of the sound signal's spectrum, based on an input of 0-100?