4Pockets are offering 3 apps at a reduced price for a limited time.
- PolyPipe – $14.99 to $7.99
- Copperhead – $14.99 to $8.99
- Audio Shredder – $9.99 to $4.99
PolyPipe
PolyPipe is an AUv3 MIDI Sequencer plugin for iOS which can be loaded into your favorite DAW. It comprises elements of some of my favorite sequencers of all time, all rolled into a single interface.
PolyPipe is a multi-lane, polyphonic sequencer designed for creating evolving musical patterns rather than fixed, repetitive loops. Instead of thinking in terms of a single step sequence, PolyPipe lets you build multiple independent lanes, each with its own rhythm, pitch logic, octave behavior, probability, and modulation data all running together as a coherent musical system.
At its core, PolyPipe takes incoming MIDI notes (or internally generated notes) and uses them as a musical “seed.
These notes are then processed through patterns, scales, transposition rules, and step logic to generate new musical phrases in real time. This makes it especially suited for generative music, complex arpeggiation, bass-and-chord splitting, and long-form evolving sequences.
Each lane in PolyPipe is its own sequencer voice. A lane contains one or more patterns, and each pattern is made up of steps. Steps don’t just define when a note plays they can also define how it plays. A step can include pitch offsets, velocity, gate length, strumming, probability, repeats (ratchets), ties for legato behavior, and even chord information.
Patterns can be enabled or disabled independently, shifted by octaves, and combined with global transposition. Because lanes can have different lengths, directions, and step modes, the resulting sequences naturally phase against each other, creating variation without manual intervention.
PolyPipe applies musical logic at the MIDI output stage rather than hard-coding notes upfront. Pitch values can be forced into a chosen scale and key, allowing even highly experimental patterns to stay musically coherent. Different step modes (such as forward, backward, ping-pong, random, chord, bass, or hybrid note/chord modes) let each lane behave differently, from traditional arpeggios to controlled chaos.
PolyPipe Sequencer is built for musicians who want to explore ideas quickly, create unique patterns, and discover results they wouldn’t think to program manually. It rewards experimentation: small changes to probability, repeats, or step logic can dramatically alter the musical output while staying rhythmically locked and musically usable.
Copperhead
Copperhead is a digital subtractive synthesizer plugin which draws its influence from the vintage synthesizers of the early 80’s.
Copperhead has polyphony, a built-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.
4Pockets 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.
Audio Shredder
This is a AUv3 compatible audio effect which can be used as plugin with your favourite DAW such as Cubasis, Meteor, Auria or GarageBand. It supports a modern graphical interface and presets with stereo meters for monitoring signal levels.
This audio shredder does just what is says, it shreds incoming audio (usually strings or lengthy sustained chords) into bite size pieces, adds an envelope and passes through a filter of choice. The result is a gated staccato effect which you can shape into patterns or runs of quarter notes. These kinds of patterns can be heard in Trance / Dubstep / Hip Hop or other modern electronic music genres. You can control both left and right stereo channels independently, with control over pulse width, attack and release.
There are 4 difference filter types (Low Pass, High Pass, Band Pass and Notch) which can be enabled, with independent control over cutoff frequency and resonance. You can even randomise new settings each step for some incredibly complex and pleasing textures.
Each quarter note can be independently triggered or you can join them together to create longer runs.
This plugin allows complete parameter automation and auto sync to master tempo.
For more information on these and other 4Pockets apps, click here:
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