# Jacquardi4 — MIDI Envelope Generator

> MIDI Envelope Generator (iPhone/iPad app by Satoshi Kajii.)

- Source: https://appshunter.io/ios/app/jacquardi4/id6786135940 (this page in markdown: same URL + `.md`)
- Developer: [Satoshi Kajii](https://appshunter.io/developer/1777441634)
- Category: Music
- Price: $5.99
- Age rating: 4+
- Requires: iOS 15.0 · 12 MB
- Released: 2026-07-06
- Data updated: 2026-08-24
- User reviews in markdown: https://appshunter.io/ios/app/jacquardi4/id6786135940/reviews.md

## What is Jacquardi4?

Concept:
“Jacquardi4” is an AUv3 instrument that does not make any sounds but can send out 4 analog-like “Envelope” signals via MIDI control changes (MIDI CC). That is, the app contains 4 MIDI modules of envelope generator. The user can use them for modulating any parameter of 3rd-party’s plugins that can be assigned to MIDI CC , for example, cutoff frequency.  

System Requirements:
AUv3 host that has a flexible capability of MIDI routing (AUM, apeMatrix, LoopyPro, etc).

Usage:
Just assign MIDI keyboard to Jacquardi4's MIDI IN (it needs to trigger Jacquardi4) and assign Jacquardi4's MIDI OUT to 3rd party's plugins.

Explanation of sliders:

Channel: determines MIDI channel.
Control Rate: determines the resolution of MIDI processing. Higher value, higher resolution.
Active: turn on or off the module. Useful when using MIDI learn functionality of 3rd party plugin.
MIDI CC: determines MIDI control number. (text-editable)
Amp: determines amplitude in dB
Offset: determines an initial value.
Attack: attack value.
Decay Time: decay time value.
Decay Curve: decay curve value.
Sustain: sustain value.
Release: release value.

Explanation of Preset File System:

At first make a new bank folder, in which you can save a preset file. And push "Save As" button.
Also the user can export or import preset files.


## Version history (last 4 releases)

### 1.0.3 — 2026-08-03

Preset Manager: Canceling the import caused a crash. Now fixed.

### 1.0.2 — 2026-07-26

1) The previous fix for the multiple-instance issue was incomplete. Now stable!

### 1.0.1 — 2026-07-20

1. The app sometimes would not send out MIDI CC when multiple instances were launched in DAW. Now fixed!
2. A minor bug fix in the section of preset manager.

### 1.0 — 2026-07-06

No release notes.

## Apps similar to Jacquardi4

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Tonic Synth — AUv3](https://appshunter.io/ios/app/tonic-synth-auv3/id6783345229) | 5.0 (1) | $29.99 | Music |
| [TwistedWave Remote](https://appshunter.io/ios/app/twistedwave-remote/id432930337) | 4.8 (5) | Free | Music |
| [resonatedo](https://appshunter.io/ios/app/resonatedo/id6444891127) | 5.0 (8) | $3.99 | Music |
| [Modsync](https://appshunter.io/ios/app/modsync/id6758965089) | — | Free | Music |
| [XenoVerb - Reverb Suite](https://appshunter.io/ios/app/xenoverb-reverb-suite/id6752956183) | 5.0 (3) | $9.99 | Music |
| [WoodTroller](https://appshunter.io/ios/app/woodtroller/id6445840179) | 4.8 (6) | $9.99 | Music |

## More apps by Satoshi Kajii

- [StereoLoco](https://appshunter.io/ios/app/stereoloco/id6737751583)
- [shortReverse](https://appshunter.io/ios/app/shortreverse/id6738296410)
- [Jacquardi](https://appshunter.io/ios/app/jacquardi/id6738633198)
- [DeDrummer](https://appshunter.io/ios/app/dedrummer/id6744193942)
- [pitchBender](https://appshunter.io/ios/app/pitchbender/id6744398563)
- [DeHiss](https://appshunter.io/ios/app/dehiss/id6744572519)

All apps by Satoshi Kajii: https://appshunter.io/developer/1777441634

---

*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 2026-08-24.*