This Ableton-official walkthrough introduces Granulator, a Max for Live instrument built for granular synthesis, then shifts focus to the Envelope MIDI effect and its multi-parameter mapping capability.
The Envelope device can be routed to control any parameter visible in Live's interface. Here it's mapped to the frequency of an Auto Filter, then extended to also control the dry/wet of a Reverb in the same signal chain.
The key detail is the yellow icon found on certain core Max for Live devices. Clicking it unlocks simultaneous mapping to multiple parameters at once, across different devices, without any patching or workarounds. That single feature turns the Envelope from a one-to-one modulator into a flexible, multi-target automation source.