Operator: Victim of an LFO Abduction

Ableton Live is a great software sequencer and here is a guide how to use their latest software instrument

A tutorial of using "Operator" in Ableton Live:

In this installment of the Ableton Tips & Tricks, we'll explore some of the possibilities of Operator's LFO section. LFOs (low frequency oscillators) have been a favorite tool of sound synthesists for many years; they're great for creating periodic timbre and volume changes similar to those found in familiar acoustic instruments, but they're also handy for crafting out-of-this-world effects and weird space noises. In the following examples, we'll create some alien magic using Operator's LFO controls and other unique features. FM synthesis has never been easier! As we work through the examples, keep your eyes and ears open for inspiration - you'll soon be heading off in new creative directions, crafting your own sonic textures.

Identified LFO

The waveform frequency of an LFO is usually so slow that if we were to listen to its output, we would perceive it as a rhythmic pulse rather than a pitched tone. For decades, synthesists have used these slow oscillators to influence (or modulate) the other parameters of synthesizers, such as pitch and volume. When routed to pitch, an LFO serves to simulate vibrato, and when an LFO influences amplitude (volume), it creates tremolo. Operator's LFO engine provides many of the more familiar LFO effects, as well as several that are new and "unclassified."
See the excellent tutorial here.