Enter your email address

ENVOLVER Fred Anton Corvest

Contour follower of your input signal, delivering envelopes via MIDI CC

Download on the App Store
  • Detection of the contour of the input signal and output of the envelope via MIDI CC
  • Suitable for any situation: sidechain (VCA), wah VCF...
  • Stereo or Mono processing
  • Fine tuning of each envelope circuit; rising and falling time, depth and inverter
  • Parameterable MIDI CC number
  • Input signal can be attenuated, amplified or muted
  • Multi-waveform graph per audio channel: envelope contour layered over input signal
  • iOS Audio Unit V3 supported in compliant hosts

Main features

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. Following the diagram below, the sound flows from the left to right or from the input to the output.

  • Gain (up to 15db) Use it carefully
  • Audio output activated or mute
  • Monoize input signal for detection
    • [ON] Mono for each env
    • [OFF] Left for first env and Right for second env
Output envelope 1 (L) and 2 (R)
  • Mute - left buttons (|1/ or |2/) are toggleable (gray muted/yellow activated)
  • Rise - defines the time the envelope takes to rise. Set to minimum to catch the transient.
  • Fall - defines the time the envelope takes to fall. Set to maximum for more slew between peaks
  • Depth - provides attenuation or amplification of the envelope

  • Multi-waveform graph - envelope contour layered over input signal. Touch the graph to freeze the display temporarily.
  • Invert - invert the envelope
  • CC# - number of the control change messages where the envelope is sent (channel 1). Only one CC can be used at time per output.

As with all FAC products, the interface has a unique sober look and provides a great user experience. The value of each knob can be monitored at any time and two waveform viewers provide an accurate visual monitoring of the input signal levels layered with the output envelopes. The knobs are very responsive, natural and follow a specific curve according to the parameter type.

An envelope follower has a lot of usage and the options are limitless for modulating any MIDI controllable parameters!
The following list provides some classic ways to use it:

  • 1️⃣ 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, or see the provided demo video. 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. Oh yes FAC Maxima will be the perfect companion tool for this task!

  • 2️⃣ Filter follower

    Map the envelope to the cutoff of your filter, increase the resonance to your taste. As you play your instrument, the cutoff will increase or decrease accordingly. The trick is to adjust the depth, and if you have AUM, the range of the contolled parameter as well. This video provides a quick overview about the fx demo video.

💡Please refer to the know issue section if you encouter any issue.

💡The following diagram provides an overview of the signal path

Preset Management

Envolver also comes with some factory presets to provide you a source of inspiration to satisfy your needs in any situation you might require.

The preset button provides common management features: loading, organization, and saving. The left and right arrows allow fast navigation short cut among all the presets (factory + user), a short press on the center label provides a detailed list of all the available presets, select the one you want to work with. On the other hand a long press (hold) provides contextual operation. For factory presets it's possible to save the current preset to a user preset, for user presets it's possible to rename, save and delete the current preset.

Warning about the "Larsen effect" in the main iOS host app. In the input section, it's possible to choose a mic as input. This may cause audio feedback, check your levels to avoid any damage to your system. In general, use the gain and feedback in parsimony, to avoid any excessive levels that may damage your ears or your system. FAC Envolver shall not be liable for any loss or damage of whatever nature (direct, indirect, consequential, or other) to your material (software, hardware, or other).

FAC Envolver --- Advanced Demo AUMFAC Envolver Demo And Routing Example in AUM FAC Envolver --- Demo AUMFAC Envolver Controlling Moog Filtatron Cutoff and More FAC Envolver --- Tutorial BM3FAC Envolver And BeatMaker3 MIDI Macros Demo FAC Envolver --- Tutorial AUMFAC Envolver Tutorial for the iPad

FAC Envolver - AUM (Routing CC1 to VCA Channel 1)

FAC Envolver - AUM (Routing CC4 to cutoff of Filtatron and CC2 to VCA Channel 2)

FAC Envolver - BM3

Download on the App Store