Setting the cutoff frequency of a lowpass filter to sub audio frequencies creates a portamento effect when used with control signals.
This Max example was adapted from a Pd jet engine patch by Andy Farnell in “Designing Sound”. Its used as an inertial delay, or portamento to ramp up and down the pitch of the engine.
The LPF needs to be extremely low frequency.
download
max-projects: https://github.com/tkzic/max-projects
folder: slew-limiter
- slew-limiter.maxpat