iPad Screenshots


Kuvert allows you to draw five different envelopes. These envelopes control different effect parameters, and can be drawn freely or onto a grid. The envelopes are looped, while the incoming audio isn’t (unless you’re feeding it looped material of course). This is a powerful & fun way of altering your sounds to a whole new level, sometimes not even recognizable! Thanks to the looping nature of the plug-in, it will fit very well into any musical context. One way of using it would be to revitalize any looped material within a few seconds.

Noteworthy features:

• Volume envelope
• Low cut filter envelope (with resonance)
• High cut filter envelope (with resonance)
• "Glitch" envelope (alters timing)
• Delay send envelope (with tempo synchronised time, filter and feedback
• IAA (With tempo sync if host sends it)
• MIDI clock sync
• Load / Save presets
• Audiobus
• Documentation (on the product web page)

Check out the product web page for a video demo.

Feedback or suggestions? Drop us a mail: support(at)klevgrand.se or @klevgrand on Twitter

What’s New

Version 1.0

This update is signed with Apple’s latest signing certificate. No new features are included.

Ratings and Reviews

3.9 out of 5
16 Ratings

16 Ratings

Strizbiz ,

Pleeaaaassseee make it an Audio Unit

Great app, I love what it does but I pulled the trigger a little to fast and didn’t read the description carefully and thought it supported AUV3. What it does is awesome but I’ve moved away from non Audio Unit apps and this is going to collect dust.If the developers are reading this please make this an AU ASAP! Thx

djAlpad ,

Tempo based wackiness

This is a great tool for filtering and twisting live and recorded audio. I am in love with the time/pitch stretch feature! Give that added bit of analog wobble to your music... Just give it a try. Worth every penny

Urbvac ,

Doesn’t Work

Running it in Cubasis through IAA on my fully updated iPad Pro. Does not work at all. It’s a shame because their other apps, especially Korvpressor, are great.


Klevgrand Produkter AB
8.9 MB

Requires iOS 7.0 or later. Compatible with iPad.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like