You can create a simple envelopes with a single Stage module:

• Attack-and-Hold Envelopes
• Decay-and-Hold Envelopes

For additional control and versatility, use a Booster Stage instead of a Stage.

See also:

• Generating Multi-Stage Envelopes
• Techniques and Variations: how to wire multi-stage envelopes, how to add hold and sustain stages, and how to create retriggerable envelopes, uninterruptible envelopes, looping envelopes, and other interesting variations.

Attack-and-Hold Envelopes

• Connect a trigger source to the TRIG input.
• Leave the IN input disconnected.
• Set the LEVEL knob to the desired hold voltage.

Decay-and-Hold Envelopes

This is very useful for plucks:

• Connect a trigger source to the TRIG input.
• Connect a voltage source to the IN input to supply the envelope’s starting voltage.
• Set the LEVEL knob to the desired hold voltage.

Note: It may be useful to use the trigger signal to supply the envelope’s starting voltage, as we’ve done in this example.