iPad Screenshots


This is an AudioUnit v3 plugin only. To be used in a 3rd party host app.

DD-21 is a distortion, fuzz, overdrive, saturation AUv3 effect plugin / app extension modelled on the audio distortion introduce in to a circuit by diodes. This type of audio distortion is pleasant to the ear and can be found in numerous audio equipment and countless recordings.

DD-21 allows the user to dial in a varying range of distortion from subtle analogue warmth to crunchy fuzz.

Input gain control
Curve slope control
Output volume control
Mix control

What’s New

Version 1.0.1

Compact view added for screen scalability.

Ratings and Reviews

4.2 out of 5
5 Ratings

5 Ratings

JohnFBP ,

Simple, great sounding distortion

Love a well designed, hyper functional effect. Took me seconds to dial in a great sounding dist/fuzz tone for the drum loop I was working with. Will be reaching for this often. Thank you, Dev

anickt ,

Sounds great!

Nice job Paul

Eriptron ,

Not worth braving the orange!

The white font on bright orange is next to impossible to read. Real cute. The sound? Eh. I mean it’s distortion. Developer apparently doesn’t know how to expand the GUI. Doubt I’ll use.

App Privacy

The developer, DesignByPaul, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

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

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