FAC Envolver Ver 2 Noise Gate
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Being a MIDI effect in its essence, controlling your synthesizers parameters (e.g volume, cutoff, res) with MIDI CC and notes, FAC Envolver is also able to transform the input audio via two exclusive effects: a Noise Gate and a Trance Gate. This combination is the key to breathe life into your sound, providing interesting natural modulation and sequences that will always be different by nature.

What’s New
Version History
Aug 3, 2018 Version 2.0
• Two circuits: Env Follower and Trigger Gate (Audio/MIDI fx)
• Each circuit provides MIDI out (CC/Note) and optional audio transformation
• Env Follower provides a Noise Gate with threshold, hysteresis and curve smoother
• Trigger Gate provides a Trance Gate Style fx with optional resolution and patterns
• Stereo/Mono processing – a slot per channel
• Fine tuning of each slot; rising and falling time, bias, depth and inverter
• MIDI IN/OUT support: CC#, channels, int/ext note pitch and scale progression
• Multi-waveform graph: input signal, env contour, gate signal and threshold
• Host tempo sync

Under the hood, FAC Envolver is an envelope follower delivering MIDI data generated from the contour of a signal. The source of this signal may come from two distinctive circuits: the first one is a classic envelope follower and the second one is a rythmical pattern called trigger gate. Both circuits are responsible for providing a signal envelope that can be altered by a set of parameters and delivered as MIDI control change messages (CC).

The generated signal envelope also passes through a gate detection mechanism driven by a threshold. When the signal goes above the threshold, the gate is open and when the signal goes below, the gate is closed. This open/close sequence provides a second envelope which is delivered as MIDI CC (on/off) and notes. The pitch of the note may be set within the effect or from an external value provided by MIDI input. Both may follow a particular scale progression.

The envelope follower circuit also provides a noise gate to control precisely the level of your audio signal. This uses the same open/close sequence built by the gate detection mechanism that delivers MIDI data but acts on the audio. Following the same logic, when the second circuit – the trigger gate – is engaged, the open/close sequence provides a trance gate style effect to the audio.

FAC Envolver is a stereo effect and provides two slots, one slot per channel. Both can be linked to facilitate the manipulation. The audio can also be turned to mono and the dry and wet audio can be mixed.

Note: The MIDI/AUDIO combo makes FAC Envolver usable in every host, even the ones that still do not provide MIDI out support, in this case the MIDI generator is disabled and the fx can be used as standard AUDIO fx.

Get Envolver

FAC Envolver Envelope Follower
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FAC Envolver is an envelope follower, this implies that it tracks the contour of the input signal and builds a corresponding envelope. Think of the envelope as the outline of the graphical representation of a rectified version of your input signal. By its very essence, it’s exactly what you get. But the process does not stop there and gives you the ability to modify the shape according to a set of provided parameters.

So it’s possible to define the rise and fall time as well as the depth of the envelope or also to invert it. Those parameters are the key to ensure the flexibility of the effect, and to meet the goal you are looking for.

The previous lines are more a general presentation of what an envelope follower does, but the particularity of FAC Envolver, which makes it an outstanding and versatile tool, is that it delivers the envelope via MIDI control change messages or commonly referred to as CC.

The key is to map the CC number parameter to the volume, cutoff, resonance control of your synthesizer or effect units. By doing so you will get instant additional hands to tweak your parameters automatically depending on what you are currently playing.

The internal signal path is built around two independant channels, having one envelope circuit detection per input signal. So the left input signal is wired to the envelope one, and the right input signal is wired to the envelope two.

FAC Envolver will breathe life into your sound, providing interesting natural modulation that will always be different by nature.

• Tips!
An envelope follower has a lot of usage, the most famous is probably the ducking or sidechain effect. The trick is to invert the envelope and map it to a VCA receiver. Whenever an input signal is present, the envelope is generated and the sound controlled by the VCA is attenuated accordingly. The advantage is that we don’t need to sync anything as the follower will output what it receives.

Have a look at the “sidechain” preset and use it as template. Note that it’s very important to set the gain of the input signal by setting properly the input gain parameter provided. Use the waveform viewer provided to have an idea of the current level.

Get FAC Envolver


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