# Envelope Follower

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### Overview

The envelope follower can be used to create modulation signals from nearly any point within the polyphonic synthesis engine. It can track the amplitude of individual sound sources, both pre and post level control, allowing you to apply the dynamics of one sound source onto another, create internal sidechain ducking, and much more.

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### 1. Input Source&#x20;

**Follower Source.** Choose which sound source(s) the envelope should follow.

* The **Summed** option will use all active sound sources after they have passed through the **Engine** filters, but before they pass through the **Effects** rack.
* Individual sound sources are also available, enabling you to create ducking effects between modules.
* The **Post level** options include the gain from the module's **Level** control, while the **Pre Level** options do not.

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### 2. Follower Controls&#x20;

**Invert Level.** When activated, the envelope follower will be inverted, making it easier to use for ducking effects.

**Attack Time.** Set the amount of time it takes for the envelope follower to reach the maximum level of the input signal.

**Release Time.** Set the amount of time it takes for the envelope follower to return to a lower value when the input signal becomes quieter.

**Sync.** Enable BPM synchronization for the envelope follower's attack and release.

**Level.** Attenuate the envelope follower’s output signal. This will impact the modulation wherever it is assigned.