ENV

Envelope Generator with Multiple Algorithm Options (MIDI Controllable).

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$20
ENV

This is an envelope generator with three different algorithms. It can be controlled via MIDI or CV/Gate.

It has two main control knobs, named CV1 and CV2. They control parameters of the envelope algorithm.

Algorithms

There are three different algorithms, and you can cycle through them by holding (about 1 second) the "ALGO SELECT" toggle button. When you release it, an LED will flash to indicate the current algorithm.

Here are the algorithms:

1. Hold Release

  • The envelope first reaches the maximum value.
  • It then holds for up to 100 ms, controlled by CV1.
  • Finally, it releases to 0V at a rate controlled by CV2.

2. Attack Release

  • The envelope starts at 0V.
  • It attacks to the maximum value at a rate controlled by CV1.
  • It then releases to 0V at a rate controlled by CV2.

3. Attack Sustain Release

  • The envelope starts at 0V.
  • It attacks to the maximum value at a rate controlled by CV1.
  • It sustains at the maximum value until the GATE is released.
  • It then releases to 0V at a rate controlled by CV2.

Gate Modes

You can trigger the envelope via manual GATE trigger or via MIDI. There are three modes, including a special MIDI mode. You can select them by holding the MIDI GATE button for at least 500 ms.

1. GATE MODE

The envelope will be triggered using the signal passed to the GATE In input pin.

2. MIDI MODE

The envelope will be triggered using the MIDI Gate signal.

3. MIDI_VELOCITY MODE

This is the same as MIDI MODE, but it will also modulate CV2 using the velocity. If you are using this mode, make sure to start with velocity = 0; otherwise, CV2 will be open regardless of the physical CV2 knob position.

Inputs

  1. MIDI In
  2. GATE In
  3. CV1
  4. CV2
  5. Debug pin for the microcontroller
  6. Programming pin for the microcontroller

Outputs

  1. MIDI THRU
  2. Envelope Output
  3. Envelope Output
  4. Envelope Output
  5. Envelope Output

Controls

  • CV1: Controls the CV1 parameter for the selected algorithm. If a CV1 input is provided, this acts as an attenuverter.
  • CV2: Controls the CV2 parameter for the selected algorithm. If a CV2 input is provided, this acts as an attenuverter.
  • ALGO SELECT toggle button: Cycles between algorithms.
  • MIDI GATE toggle button: Selects Gate Modes.

MIDI

  • Use any MIDI note to trigger a GATE signal.
  • CC 22: Modulates CV1.
  • CC 75: Modulates CV2.

Additional Parts

This section is only relevant if you are buying the semi-assembled module. You have to source and solder the following parts. You can check our guide on common parts for where to source these components.

  • 2.54 mm header pins (5-pin) - 2
  • Circular pin header sockets (5-pin) - 2
  • 1M potentiometers - 2