How to Diagnose Retrigger Clicks That Persist After Changing the Envelope

Save a copy of the patch and create a short MIDI test passage with constant velocity. Include four situations: one isolated note followed by silence, repeated notes at the same pitch, alternating pitches with a gap, and alternating pitches that overlap. Leave enough space after the isolated note for its release to finish.

Record the instrument’s output and compare the click with the MIDI note boundaries. Listen separately for the beginning of the new note and the end of the previous one. When two events happen together, they can sound like a single faulty attack. Temporarily moving the second note later helps separate them.

Use this table to choose your next test. These are diagnostic leads, not proof of a particular cause.

Where the click occurs	Next controlled test
At an isolated note’s start	Confirm amplifier routing, then test attack and oscillator phase
At note release	Adjust release independently of attack
Only when notes overlap	Compare retrigger, legato, and polyphonic behavior
Only on repeated identical pitches	Check same-note voice replacement
After several notes or chords	Test available polyphony and release overlap
During a sustained note	Disable envelope loops, sample loops, and modulation individually
At changing positions between playback passes	Compare buffer settings and processing load

Make an unmistakable temporary change: set a clearly audible slow attack and play a fresh, isolated note. Does the sound swell as expected? If it does not, verify the envelope’s destination, amount, and amplifier mode before making smaller adjustments.

An envelope visible on screen may control a filter, pitch, or another modulation destination. Some instruments also offer alternative amplifier controls. Zebralette 3, for example, lets its VCA use Gate, ADSR, or MSEG. Editing ADSR will not give the expected amplifier articulation when the VCA uses Gate. Its manual also documents a Soft Attack option intended to reduce clicking with very fast attacks. See the Zebralette 3 user guide, Centre Panel.

For a layered patch, mute every layer except one and repeat the test. Bring the layers back individually. This establishes which signal path needs attention without requiring you to reshape the entire patch.

Once routing is confirmed, test attack and release separately. Lengthen attack for the isolated note’s onset, then restore it and lengthen release for the note’s ending. Treat any millisecond values you try as audition settings rather than universal fixes. Hive’s manual explicitly discusses clicks from very fast envelope stages and gives settings in Hive’s own parameter scale; those numbers should not be interpreted as milliseconds in another synth. See the Hive user guide, Envelope Tricks.

The word “retrigger” can describe different operations. An envelope restart changes a control signal; an oscillator phase reset changes the waveform’s playback position. Ableton’s Operator documentation describes oscillator Retrigger as restarting at a specified phase. Its envelope documentation separately explains restarting a looped envelope from its current level to avoid clicks associated with returning to its initial level. See the Live 12 Instrument Reference, Operator.

On a simplified patch, keep the amplifier envelope unchanged and compare oscillator reset enabled and disabled. If a start-phase control exists, compare several positions. Record each version so you can distinguish a changed transient from a quieter overall sound.

A repeatable click is useful evidence, but consistency alone does not identify the cause. Hive’s manual notes that oscillator Reset makes clicks consistent unless phase is modulated. Reset can therefore change the repeatability of an artifact without removing it. See the Hive user guide.

Also distinguish the beginning of a new waveform from the interruption of an existing one. A suitable starting phase cannot, by itself, establish that the outgoing signal ends smoothly. If isolated notes are clean but overlapping notes click, continue with voice handling.

Compare the same two-note phrase with a visible gap and with deliberate overlap. Then compare the instrument’s documented mono retrigger and legato modes. On the microKORG2, Mono Retrigger restarts the envelope generators and LFO whenever a key is pressed, while Mono Legato resets them only for the first note of a connected phrase. That distinction is documented in Korg’s VOICE, PITCH, ASSIGN manual page.

If legato removes the click, you have evidence that restarting something during the transition matters. It does not establish which envelope or modulation route caused it, because the mode may change several behaviors together. Restore the desired articulation and isolate those routes individually.

For samplers, inspect same-note retrigger behavior. In Simpler, enabling Retrig cuts off a sustaining instance when the same pitch is played again; disabling it permits overlapping instances when sufficient voices are available. The Live 12 Instrument Reference, Simpler also explains that exceeding the voice allocation drops older voices.

Next, increase available polyphony temporarily and shorten release enough to reduce overlapping tails. Test each change separately. Account for layering and unison: Korg documents eight-note maximum polyphony for a single microKORG2 timbre and four in Dual mode, with unison allocating multiple voices per note. See Korg’s voice settings.

If additional voices resolve the artifact, revisit the musical requirement. You may retain overlap, reduce release, reduce unison, or use a different allocation mode where available. Judge the result with the original phrase; a clean diagnostic patch is only an intermediate result.

Hold one note longer than the interval between clicks. If the artifact repeats without new MIDI notes, investigate internally repeating events.

For an envelope-driven rhythm, disable looping or timed retriggering temporarily. Absynth 6’s Retrigger mode, for example, restarts an envelope at intervals set by its Beat control while the note remains held. Its Loop mode repeats the section between loop markers. These behaviors are described on the Absynth 6 Envelope page. A repeating click could therefore follow an internal envelope boundary even when the MIDI passage contains one continuous note.

For a sampler, disable sample looping and audition the same region once. If the click disappears, inspect the loop join rather than continuing to lengthen the note’s attack. Ableton documents zero-crossing snapping and loop crossfades for this purpose, including the limitation that stereo snapping follows the left channel. Inspect both channels when a stereo loop remains troublesome. See the Live 12 Instrument Reference, Sampler and Simpler.

Finally, distinguish sampler playback boundaries from audio-clip edits on the DAW timeline. Ableton provides short clip-edge fades specifically to address clicks at those edits. Adjusting an instrument envelope does not edit a separate audio clip’s boundary. See Create Fades on Clip Edges to avoid clicks.

Bypass effects, then restore them individually. For the effect that brings back the click, temporarily remove its modulation assignments and set its parameters manually. Compare at similar listening levels.

A documented Hive example shows why a slow envelope can still be involved. In an original technical explanation, u-he’s Urs Heckmann describes a voice envelope controlling a shared chorus mix: a new note makes another voice’s envelope take control, and the chorus mix can jump between values. His explanation applies to that routing behavior, rather than every synthesizer. See U-He Hive Issue: Clicking.

The useful test is to keep the effect active while removing only the suspect assignment. If that clears the click, consider a global modulation source supported by the instrument, a fixed effect setting, or revised routing. Lengthening the amplifier attack may leave that separate parameter transition intact.

When the click’s position varies between passes, test the playback system before continuing patch edits. Increase the audio buffer incrementally and repeat the same passage. Ableton explains that an insufficient buffer can produce clicks and dropouts when audio processing cannot finish in time; larger buffers also increase latency. See How to avoid crackles and audio dropouts.

Compare live playback with an offline render, then play the rendered file with the instrument inactive. A clean render paired with inconsistent live crackling points toward a playback-processing issue. A click embedded at a repeatable musical event directs attention back toward the patch or source audio. Treat this comparison as evidence rather than a conclusive test, since rendering can change operating conditions.

Finish by restoring the original phrase, layers, effects, and intended articulation one at a time. Keep the smallest change that addresses the identified event, then check isolated notes, repeated pitches, overlaps, and sustained playback again. The useful outcome is a clear explanation of which transition clicked and which setting changed that transition.

• Live Instrument Reference — Ableton Reference Manual Version 12
• Zebralette 3 user guide — u-he
• Hive user guide — u-he
• VOICE, PITCH, ASSIGN — Korg microKORG2 manual
• Envelope page — Native Instruments Absynth 6 user guide
• Create Fades on Clip Edges to avoid clicks — Ableton
• U-He Hive Issue: Clicking — KVR Audio, including Urs Heckmann’s technical explanation
• How to avoid crackles and audio dropouts — Ableton