Copperhead1.24 - App Store

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 multi-note polyphony, a build in arpeggiator, and a host of integrated audio effects. Copperhead features a custom String Machine, the ability to design your own custom waveforms, as well as supporting oscillator sync and various cross modulation effects. 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 other user definable types. The app features pulse width modulation and supersaw, as well as a customisable string engine and the ability to create your own oscillator types.

The Voltage Controller Filter supports the usual LP, HP, BP and Notch filters in series or parallel configuration, 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. Copperhead now ships with over 550 presets which cover just about every instrument category you would ever need.

○ 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.
○ More than 550 built-in presets.

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

Version History v1.24 B104
Fixed an issue which was causing problems when the Preset Manager was open. We saw slow downs in main screen rendering (iOS bug). 1.24 5d ago v1.23 B103
Fix for UI issue on some devices using iOS26.1. 1.23 12/02/2025 v1.22 B102
Fixed toolbar content issue misalignment in iOS26.1 (due to bug in iOS 26.1 was fiine in 26.0) 1.22 11/20/2025 v1.21 B101
Added a new preset pack from DMT Cymatics with anorher 123 presets.
Added a Haas Effect and an EQ in the Output Options window (Long press the Limiter button).
These new features are saved as part of the preset. The Haas option improves stereo imaging in presets that don't use the sequencer. 1.21 10/03/2025 v1.11 B93
Updated for compatability with future iOS Versions. 1.20 08/27/2025 v1.19 B98

Fixed an issue where CONTROLLER packets were being processed after TONE PACKETS causing a delay in the sequencer being enabled/disabled.

Added a second controller. Controller #2 from Heliums chord track now activates the GATE in the FX section. 1.19 06/24/2024 v1.18 B97
Now supports compact Tone Packets
Helium's Controller 1 from a chord track now enables the ARP (0-OFF, 1-ON) 1.18 06/17/2024 Added Tone Packets support. 1.17 05/29/2024 v1.16 B94
Fixed an issue using the Formant filter due to a bug introduced in a previous version. 1.16 05/08/2024 v1.15 B91

Added an awesome new preset bank from Spidericemidas. This bank features 111 new Bass, Pads/Atmos and Synth presets.

Fixed a possible crash due to divide by zero when using the super saw waveform in certain circumstances.
Fixed an issue where the app is not showing the proper version number when hosted as an AUv3.
Fixed an issue in standalone mode where the left most key on the piano keyboard is less responsive due to system gestures. 1.15 02/04/2024 v1.14 B90
Fixed an issue which caused CC values from the sequencer to be sent incorrectly causing patches to sound out of tune.
Fixed a strange issue causing some patches to load incorrectly if MPE is enabled. 1.14 01/18/2024 Added basic MPE support.
When MPE is enabled the pitch bend acts on a per note/channel basis.
When MPE is enabled the channel aftertouch acts on a per note/channel basis.
You can map CC74 to the CC1 modulation settings.
Added an option to the Mod Wheel settings for controlling Aftertouch.
Added a knob mode to the Settings menu (Vertical+Horizontal/Vertical/Horizontal).
Added a per note/channel modulation of Filter Cutoff and Resonance when in MPE mode. 1.13 10/09/2023 v1.12 B84
Fixed a spelling issue in the randomize where a \n appeared on screen.
Fixed an issue where the string machine was creating invalid floating values (NaN) and causing the VCF to throw a tantrum. 1.12 08/30/2023 v1.11 B83
Added a new Bank/Sub-Bank window to support Program Change.

To use select Open Window -> Presets Bank Setup. You can drag and drop presets directly from the Program Manager, or add whole groups as one using the 'Presets To Bank' button. 1.11 07/11/2023 Fixed an issue where custom ARP's were not always being loaded correctly. 1.10 06/01/2023 Fixed an issue where low BPM ( less than 50bpm) combined with long delays were causing a crash.
Other minor fixes. 1.09 04/28/2023 v1.08
Added an all new Stellar Anomalies preset bank courtesy of oddStar.
Fixes an issue saving the last help manual location.
Updates help manual. 1.08 04/20/2023 v1.07
Fixed an issue running on iPhone when Full Screen is enabled. Users are unable to click on content on the far right of the display.

v1.06
Added a '*' next to any controller that is in use in the sequencers controller menu.
Added a new randomize controller dialog, with range, smoothness and symetry options.
Randomizing notes in the sequencer no longer clears the assigned controllers.
Added a boost knob to the String Machine oscillator window.
Added a new Randomize Patch window to help create patches without in depth knowledge of Copperhead.
You can now automate the 8 wave types from the sequencer allowing wave sequencing type effects.
Added a new Chord Index Mode to the sequencer.
Added a few extra filter modes (Moog, Korg, Resonator and All Pass).
Added a second VCF, and the pair can work in series, parallel or one per oscillator.
The sequencers continuous pattern mode now works as expected when SYNC is disabled.
Fixed an issue with changing sample rates mid session.
Added a MIDI CC Control option to Settings that allows you to restrict CC control coming into the synth. 1.07 03/29/2023 Added a '*' next to any controller that is in use in the sequencers controller menu.
Added a new randomize controller dialog, with range, smoothness and symetry options.
Randomizing notes in the sequencer no longer clears the assigned controllers.
Added a boost knob to the String Machine oscillator window.
Added a new Randomize Patch window to help create patches without in depth knowledge of Copperhead.
You can now automate the 8 wave types from the sequencer allowing wave sequencing type effects.
Added a new Chord Index Mode to the sequencer.
Added a few extra filter modes (Moog, Korg, Resonator and All Pass).
Added a second VCF, and the pair can work in series, parallel or one per oscillator.
The sequencers continuous pattern mode now works as expected when SYNC is disabled.
Fixed an issue with changing sample rates mid session.
Added a MIDI CC Control option to Settings that allows you to restrict CC control coming into the synth. 1.06 03/11/2023 Added the new Spidericemidas preset bank 'Arps and Sequences'.
Updated the 'SoundForMore' preset bank.
You can now drag windows outside of the effect frame and interact with them.
Added a new Resonator effect which allows us to add feedback and tuned harmonics.
Added a new multi-mode overdrive effect.
Added Overdrive gain as a modulation source in the sequencer.
Added Resonator Frequency and Feedback as modulation sources in the sequencer.
Added the ability to control Distortion Daturation as a modulation source to the sequencer.
Improved the reverb CPU usage at idle.
Fixed some potential none initialised variables.
Fixed an issue using the randomize on the gate.
Added faster pink and white noise generators.
Added a gaussian noise generator (slower than above but more evenly distributed).
You can now change the Sub Oscillator wave type.
Fixed an issue changing patch with sequencer running.
Fixed a spelling mistake in the controller menu.
Fixed an fx syncing issue in standalone mode.
Updated MIDI control parameter list in help. 1.05 02/25/2023 Added a velocity curve knob (long press Mono button).
Added a velocity controlled brightness knob (long press Mono button).
Added a second page to the FX screen with a Stereo Flanger and Stereo Phaser.
Added a Bit Crusher effect to the FX screen.
Added an option to bypass existing effects. Long press 'FX' button to toggle setting.
Added Delay and Reverb Gate options to the sequencer. This allows you to control what notes go through these effects without effecting the effect trails.
Modified delay so that higher mix settings include more dry signal to maintain volume.
Added a note gate mode to the sequencer controllers. Overrides the fixed gate.
The LFO2 frequency knob now goes up to 5KHz to generate AM/FM modulation of VCO's.
Added Flanger/Phaser option to Mod Wheel settings to control LFO position from mod wheel.
Added Flanger and Phaser Mix options to the sequencer modulation list.
Added Bit Crusher Downsampling to the sequencer modulation list.
You can now define your own color schemes that can be saved/loaded/backed up etc. Long press main menu button.
Init Patch now removes old file name and displays 'Init Patch' instead.
Added the ability to import/export preset banks manually without drag and drop (long press the Create Bank button).
Finally fixed issue with delay not being heard after switching patches.
Fixes the detuning issue after changing Sequencer mode to chord offsets.
Fixed an issue where in standalone mode the beat position was not initialised properly causing no sound on rare occasions in the sequencer.
When a scale is active, you can normally only play white notes. I have added an option that allows black notes to sound, only they are forced to the nearest note in the scale. You can change this option setting from the sequencer menu.
Improved the note stealing algorithm to prioritise none pressed voice that are still sounding before killing off held notes.
In standalone mode when the device is in portrait orientation, the whole interface is now visible.
The String Machine now shows a waveform of the generated wavetable.
Added the ability to select a noise type (white to pink noise).
Updated help with a table of all the CC controllers supported. 1.04 02/13/2023 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. 1.03 01/23/2023 Added a few more default patches.
Added a note repeat to the sequencer. When the REPEAT button is pressed it displays the number of repeats for all notes. TAP, HOLD and drag vertically to change from 1-4.
Expanded Copy/Paste sequence options (you can now copy between controller lanes).
Added a new set of presets from Leo at SoundForMore.
Added a prompt to tell customers to run in standalone mode to install new presets.
Added the 3 new MasterClass YouTube video tutorials to the help.
Added a Latch Mode button to the sequencer window (no more menu diving).
Added a new sequencer mode 'Modulation Mode' which automates controllers only (can be used like additional LFO's)
Added a Modulation Smoothing option to the sequencer which is an alternative to hard stepping controllers.
Added more options to the note randomization in the sequencer (note range and note skip).
Added LFO1 and LFO2 frequency controllers to the sequencer (turn LFO Sync off to use).
Added OSC1 and OSC2 fine tune and Oscillator Mix controllers to the sequencer.
Added Mod Wheel and Pitch Bend as modulation controllers to the sequencer. 1.02 01/10/2023 v1.01
Fixed an issue where preset name was not always updated when loading a session.
Added channel aftertouch control.
Added a channel aftertouch mode select (velocity or mod wheel assignments).
Added a modulation wheel control for LFO1 and LFO2 speed to the settings menu.
Added a setting to enable Sequencer MIDI data. 1.01 12/15/2022 1.0 12/11/2022