# FAC Envolver — user reviews > 14 indexed App Store user reviews of FAC Envolver by Frederic Corvest, rated 4.90/5 from 41 ratings. - Source: https://appshunter.io/ios/app/fac-envolver/id1378195291/reviews - App overview in markdown: https://appshunter.io/ios/app/fac-envolver/id1378195291.md - Rating breakdown: 5★ 40 · 4★ 0 · 3★ 0 · 2★ 0 · 1★ 1 ## Newest reviews (3 of 14) ### 5/5 — A new midi guitar method for me *2019-02-04* Ok so this is insane, or a new trick perhaps. When you pick a scale and the random notes and get the input settings optimal it’s perfect. So although you don’t pick the notes while playing, your rhythm is dead on and well it’s sweet if you get it. Hard to explain but I love it. I guess like a vocoder sorta setting is what I’m explaining I’m not sure ### 5/5 — Fabulous and unique plugin! *2018-10-10* Now with added audio features, it’s a must-have for sidechaining and gating effects. Unlike any other plugin on iOS ### 5/5 — Amazing *2018-08-08* Very useful app for the mobile musician. ## Most critical reviews (10 lowest-rated) ### 4/5 — Be very careful about buying this *2018-05-19* Read the app description carefully before buying this app. That said if you have suitable apps to run it with it’s an interesting addition to the tool kit. The dev is hopeful that other hosts may become compatible. **Developer response:** Hello Zxwerdsff? First line in App Store => FAC Envolver outputs MIDI in addition of audio, and requires to be run in a compliant system (iOS 11.0+) and host. In addition we also provide support URL with all detailed info http://fredantoncorvest.com/know_issues.html Please report to your favourite hosts to request support of MIDI output block (available in the official Apple SDK), or ask for improvement if the host does not support MIDI routing as you would have expected. ### 5/5 — Super useful for niche cases *2023-09-08* I’m using this to create an audio-responsive MIDI CC values for some custom MIDI-controlled LED lights. I simply load Envolver onto an audio channel in AUM, use AUM’s built in LPF to isolate the bass, then use Envolver’s envelope follower to output MIDI CC of the volume to a MIDI out interface. It’s awesome! Thanks for the great app! ### 5/5 — Great utility *2023-07-26* This is a super useful utility plugin. I’m using it as an audio envelope follower in AUM which then sends MIDI cc’s based on the amplitude of the signal to my lighting rig. Easy audio-responsive lights! ### 5/5 — Great with drum triggers! *2023-04-07* FAC Envolver is a fantastic app that I highly recommend for anyone looking to trigger midi notes from drum triggers. The app is incredibly easy to use, and it provides a wide range of features and options to help you create unique and interesting sounds. The app also provides a wide range of features for triggering midi notes from drum triggers. You can choose from different note values, velocities, and even select specific midi channels to trigger. This gives you a lot of flexibility and control over your sound, so you can create exactly what you're looking for. The app is designed with a sleek, modern interface, and it comes loaded with a variety of presets and sound effects. Whether you're looking for a classic drum machine sound or something more experimental, you're sure to find what you're looking for with FAC Envolver. Overall, I highly recommend FAC Envolver to anyone looking for a powerful and intuitive app for triggering midi notes from drum triggers. Whether you're a professional musician or just getting started, this app is a must-have for your toolkit. ### 5/5 — Yup another winner *2022-01-27* This developer only makes great apps. ### 5/5 — It’s Fred... *2020-04-19* What more do u need to know. ### 5/5 — Fabulous! *2019-10-18* Truly! ### 5/5 — A versatile midi power tool *2019-10-18* Whether you’re looking for a random midi note generator, trance gate, or creative ways to manipulate filters and effects in your favorite synth apps, this app does it all in a very easy to master and powerful interface. Extremely highly recommended for anyone who uses midi in their studio or live environment. ### 5/5 — 5 Star App *2019-09-25* Like all of Frederic’s apps! BUY THEM ALL! ### 5/5 — Great app! *2019-06-05* Just like every FAC apps. Highly recommended for serious musicians. Makes your music sound better! ## Most praised reviews (1 highest-rated) ### 5/5 — Very useful! *2019-02-07* Envolver is the envelope follower you need to dynamically drive effects directly from sound! The inverse envelope is great for ducking other channels if you have a midi controllable mixer. The two separate followers mean you can do some very controlled mixing! I hope there’s more in the future ... like adding a pitch detector to plonk external midi notes, but this is plenty of goodness! --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-15.*