Concept: "Jacquardi" is an AUv3 instrument that does not make any sounds but just sends out analog-like Envelope signal via MIDI Control Change (MIDI CC). That is, the app is a MIDI module of envelope generator. The user can use it for modulating any parameter of 3rd-party’s plugin that can be assigned to MIDI CC , for example, filter cutoff. Usage: Just assign MIDI keyboard to Jacquardi's MIDI IN (it needs to trigger Jacquardi) and assign Jacquardi's MIDI OUT to 3rd party's plugin. System Requirements: Auv3 host that has a flexible capability of MIDI routing (AUM, apeMatrix etc).