ASR – Dual Envelope Generator / LFO

The ASR is a highly versatile module designed to provide two channels of precise modulation control for modular synthesis.

At its core, the module functions as a dual attack-sustain-release (ASR) envelope generator, offering precise control over the shape and timing of modulation signals. Both envelopes can be triggered by a single gate input, with the second channel’s gate input normalized to the first, ensuring synchronized modulation on multiple parameters.

In addition to envelope generation, each channel includes a mode switch that transforms it into a Low-Frequency Oscillator. In LFO mode, the attack and release controls are repurposed to define the rise and fall times of the cyclic waveform. This allows users to generate evolving modulations with variable symmetry and timing, perfect for adding motion to patches.

Whether used for traditional envelope shaping, synchronized dual modulation, or creative LFO experimentation, ASR is a powerful module. Its combination of simplicity and flexibility makes it an essential addition to any Eurorack system.