Here are this weekend’s deals from 4Pockets, ending September 9th.
- PolyPipe Sequencer – $14.99 to $7.99
- DigiStix 2 – $14.99 to $8.99
- MIDI Layers – $14.99 to $8.99
- StringLab – $14.99 to $8.99
PolyPipe Sequencer
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.
DigiStix 2
DigiStix 2 is an AUv3 compatible drum machine and sampler plugin for your favourite DAW.
This new version of DigiStix brings some distinct advantages over its predecessor, most notably the ability to host up to 64 samples per drumkit with 5 layers per pad. The interface has been drastically redesigned for iPad to make better use of full screen mode, allowing a popular MPC style 4×4 pad layout with 4 banks of samples. Digistix 2 also allows greater control over the multi-sample layers, with the ability to individually control the volume levels and pitch of layers as well as global pitch and tune settings all from the new sample window.
Previously, each pad had effect sends for the internal reverb and delay effects, but this can now be routed to external busses 9 and 10 for processing using external effects.
The controller editing is now build into the main display and can be edited in place without the need to scroll the interface. It also now supports extra effect controllers. A new context aware control window allows you to quickly change pad settings without the need for popup windows.
DigiStix 2 now supports GM and original DS drum kit layouts, and includes a sophisticated multi-layer Auto Sampler, capable of recording new GM compatible drumkits automatically from your hardware. It is 100% backward compatible with the original app, and can be used as a drop-in replacement.
Drag and drop support now allows you to directly drop samples on specific layers, as well as preview and edit them directly. You can create new kits by simply combining banks from existing kits into one mega kit, or use our non destructive referencing to include sounds from other kits.
The randomize feature has been enhanced so you can randomize individual instruments or within specific banks. The new continuous MIDI learn mode makes custom mapping a breeze.
Patterns can also be exported as MIDI stems for use in other packages including a direct import to Helium clips. You can also export patterns as audio in the latest version.
The auto sample feature allows automated recording of GM compatible kits directly from hardware drum machines. The slice editor can also be used for MPC style slicing of audio clips.
MIDI Layers
Have you ever wanted to play multiple instruments from a single master keyboard during a live performance? Would you like to be able to set up keyboard splits, crossfade layers or create an ensemble of layered instruments? If you answered yes to either of those questions, then MIDI Layers may be your solution.
Layers allows you to create up to 12 scenes, each with up to 127 layers, spanning your entire master keyboard. These scenes allow you to seamlessly switch between various layer mappings at any time during a performance.
Each layer controls the MIDI output, which can be routed to one of MIDI Layers 16 output ports and 16 channels. So if you have 5 layers in your scene, each layer is able to divert MIDI key input to 5 destinations, allowing you to control 5 instruments from one master keyboard.
Layers can overlap, meaning you can create an ensemble of two or more instruments. Layers can also have cross fades so that you can fade from one instrument to another across a specified range. You can also control the velocity curves of a layer if you need to emphasize note velocity at a certain set of octaves.
Each layer can also be remapped so that you can target a different key range on the destination instrument. This allows you to have several single note layers that can target specific drum machine samples for instance.
You can assign a song per scene, or have several scenes containing parts of the same song. Switching scenes is simple, using the on screen scene buttons, via AU parameters, or you can even add a special control layer to a scene which can then be triggered via your master keyboard.
It is also possible to assign a Program Changes to a layer. When you switch scenes, each layer can fire off its own program change to your destination instruments.
Each scene can be assigned its own scale, which enables you to play using only the white notes so say goodbye to wrong notes.
Finally, layers can be assigned to mute groups, allowing you to quickly turn on/off groups of layers with a single key or button press.
StringLab
StringLab is a physical string modelling synthesizer based on Karplus-Strong theory. It is capable of reproducing the sounds of many different types of instruments, but is especially useful in the reproduction of hammered or plucked strings and other types of percussive instruments.
It works by passing carefully crafted waveforms and short bursts of white noise through a series of tuned delay lines. The delay lines have an internal feedback loop with a series of filters to mimic the natural decay of harmonics found in a real instrument. StringLab allows you to discover the character of real-world acoustics, exploring the physics of how materials interact. Many new and original textures are born out of experimenting with the settings, so don’t be afraid to experiment and create your own unique and dynamic instruments.
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