Copperhead 4+

Digital Synthesizer

Designed for iPad

    • 5.0 • 8 Ratings
    • $11.99



Copperhead is an AUv3 digital subtractive synthesizer plugin which draws its influence from the vintage synthesizers of the early 80's. Only now we have full polyphony, a build in arpeggiator, an a host of integrated effects. It features such as the ability to design custom waveforms, oscillator sync and various cross modulation modes. Cross modulation is a type of FM synthesis which can be used to morph simplistic waveforms into something far more aggressive and interesting.

At the heart of Copperhead are its two oscillators, which support all your traditional waveforms (SINE,SQR,SAW,TRI), as well as SuperSaw, Trapezium, and a user definable type. The app features pulse wave modulation for multiple sources, and the ability to sync oscillators.

The Voltage Controller Filter supports the usual LP, HP, BP and Notch filters, as well as a couple of unusual ones like Formant which allows you to sweep your cutoff to create interesting vowel sounds.

Copperhead also features twin LFO's with random and one shot functionality. It also supports Cross, Ring and FM modulators, in addition to low and high shelf filters.

One of the great features is the integrated audio gate, which allows you to generate stuttering audio right out of the box. Combined with effects such as Chorus, Overdrive, Delay, Reverb and Auto Pan / Tremelo, and the ability to specify effect order, you have a lot of control over your sound.

If that wasn't enough, we also include a 32 step sequencer, with various mono and poly modes with direct control control of various synth elements.

We have a built in Preset Manager which groups presets into banks and groups, which supports drag and drop for easy import/export of presets. You can also access your favourites from a special popup menu, or via the built in quick search facility.

○ AUv3 compatible.
○ Up to 16 note polyphony.
○ 7 Oscillator wave types.
○ Sub Oscillator.
○ PW/PWM on SQR and TRP waveforms.
○ Supports SuperSaw with MIX and DETUNE.
○ XMod / Ring and FM modulations.
○ Osc Sync.
○ 6 types of VCF filter.
○ Low and High shelf on output.
○ Built in compressor.
○ Chorus, Delay, Overdrive, Reverb and Auto Pan effects.
○ Built in Audio Gate.
○ Preset Manager with Bank/Group/Preset section.
○ Supports drag and drop to import/export presets, groups and banks.
○ Supports web transfer of presets.
○ 32 step arpeggiator.

NOTE: This is an AUv3 plugin which was designed to be hosted in DAW's such as AUM, Cubasis, GarageBand, Loopy Pro etc.

What’s New

Version 1.03

Fixed an issue with note repeat.
Fixed an issue running multiple instances and the sequencer length of instances were all linked.
Fixed a note timing issue with the sequencer.
Fixed an issue where you could not adjust the tempo when loaded as an AU3 with Host Sync disabled.
Added a new oscillator type SM (String Machine).
Updated the manual with new oscillator mode and sequencer additions.
Added additional presets bank from Ali at The Beat Community.

Ratings and Reviews

5.0 out of 5
8 Ratings

8 Ratings

anickt ,

I like it

Another winner from Paul. I’ve spent only a short time with it but I’m seeing a lot of possibilities and a better user experience than several of the synths I already have.


Another winner from Paul @

One of the Hardest working devs on ios! Happy to support! Great sounding and light on cpu! Been using it everyday since buying! Thanks 🙏

AngGroove ,

The full package

Not only a very capable synth, but also supported with a detailed series of YouTube videos by the developer - concisely walking you through all of the features.

This would have been my perfect first synth. I remember all too well not knowing my VCO fro my LFO and not having any sense at all how my VCF fit into the picture. I can’t even imagine how much learning time I could have save by having access to Copperhead and the matching masterclasses.

The layout works as well on iPhone as iPad, both in standalone and as an Audio Unit. That makes it really suitable to use as my main workhorse synth.

As with all 4Pockets app, the consistency in design ensures that learning one app transfers to all of the other ones, which is always appreciated and helps me make the most out of my music time.

Highly recommended, and if you are new to synths - don’t shy away from this one because it doesn’t have that “newbie’s first synth” look. In a couple of days you’ll be synthing more than you’d ever believe possible.

App Privacy

The developer,, 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.

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  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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