This short Ableton Live segment covers how to use the Auto Filter's sidechain input to modulate filter cutoff frequency with an external signal. The envelope control determines how strongly the sidechain signal drives the filter, while Attack and Release shape how quickly the modulation responds and recovers.
This is the same timing logic as sidechain compression, applied to filter movement instead of gain reduction, which opens up rhythmic filtering effects driven by a kick or any other source.