This Ableton tutorial walks through the Modulation section of Shifter, covering both the LFO and Envelope Follower in detail. The two tools work together to add rhythmic movement and dynamic responsiveness to any shifted, frequency-shifted, or ring-modulated sound.
The LFO offers Amount and Rate controls, with Rate running either free or synced to your project tempo. Waveform choices include standard shapes plus Random and Sample & Hold, and Duty Cycle lets you reshape the waveform further.
Two stereo modes give the LFO spatial dimension. Spin mode detunes the left and right LFO speeds relative to each other for a rotating, chorus-like effect, while Phase mode offsets the two channels to create stereo width through timing differences.
The Envelope Follower turns the amplitude of your incoming audio into a modulation source, so the signal modulates itself in response to its own dynamics. Amount scales how much the envelope affects the sound, while Attack and Release set how quickly the follower responds to rising and falling levels, letting you shape the feel from snappy to smooth.