StepPolyArp

"StepPolyArp" is a real-time polyphonic and polyrhythmic MIDI step arpeggiator and step sequencer. It can be used as a standalone application or an AUv3 MIDI effect plug-in.

The application and the plug-in can operate as a step arpeggiator by automatically generating melodic patterns from played notes or chords, or as a step sequencer that doesn't require MIDI input to play.

Unlimited presets can be saved on a local device and synchronized to iCloud. Each preset contains 16 patterns, 5 customizable polyrhythmic step controllers, and a 32 steps event matrix with 11 polyphonic and polyrhythmic lines driving the arpeggiator engine.

The application supports full internal and external MIDI connections for input and output, Ableton Link sync, and MIDI clock source sync. An internal sound bank is included.

The AUv3 MIDI effect plug-in supports multiple instances. A compatible host is required to run the plug-in. The host needs to support the Audio Unit v3 (AUv3) MIDI effect format.

Hosts supporting AUv3 MIDI effect on iOS: Logic Pro, Cubasis, Beatmaker, AUM, Audiobus, NanoStudio, Auria Pro, apeMatrix.
Hosts supporting AUv3 MIDI effect on macOS: Logic Pro 10.7 or later.

Features:

• Standalone application and AUv3 MIDI effect plug-in
• Arpeggiator and step sequencer mode
• 1 to 32 steps programmable matrix
• 11 configurable transposition lines
• Polyrhythmic lines and clock dividers per line
• Mute by line
• Gate, velocity, probability, random pitch, random gate and random velocity per event
• 16 patterns by preset
• Automatic chaining patterns
• 8 octaves resizable keyboard
• Multitasking
• Sample-accurate timing
• Internal sound bank
• Tap tempo
• Receiving MIDI from external MIDI sources
• Receiving external MIDI sync (MIDI clock)
• Ableton Link support
• Internal routing of inputs, outputs, and MIDI sync
• Send MIDI to a virtual port that can be used as MIDI input by other "Core MIDI" compatible applications
• Default velocity, modulation, pan, volume, aftertouch, and pitch bend steps controller
• Customizable steps controller MIDI setup
• Arpeggiator and sequencer can conform to the selected scale
• Predefined scales and possibility to create custom scales
• 6 arpeggiator modes
• 1 random mode
• 1 chord mode
• Randomization panel for generation of random patterns with a large number of parameters to control the result
• Presets manager
• "Program Change" support
• Preset sharing support by "AirDrop", "Mail", "Message" and other available services
• Native iCloud support
• "iCloud Drive" support in "Files" app on iOS and in "Finder" on macOS
• Full support of "Split View" and "Slide Over" on iPad
• 128 Undo / Redo levels
• Copy and paste
• Lockable keyboard (latch mode)

Supported MIDI connections:

• Virtual "Core MIDI" connections between applications
• Any compatible MIDI interface
• MIDI over Wifi
• MIDI over Bluetooth
• Ableton Link (sync and transport)

Version 5.0.1 release notes

• Custom scales • Gate by event • Velocity by event • Mute by line • A line can be scaled or not • Each line has its own clock divider and can therefore be played at its own speed • An event can be played on a specific cycle. For example, an event can be played on the first cycle, then on the third and fourth • Random pitch by event • Random gate by event • Random velocity by event • Randomization panel for generation of random patterns with a large number of parameters to control the result • In addition to being able to force an arpeggiated event to a chord note position (1, 2, 3, etc.), it is now possible to choose the last or second last note • Added a "reset" button, MIDI control and automation to reset all step positions to zero • Transposition lines have now a range from -36 to +36 semitones • Lines can be reordered by dragging • Each line, controller, pattern can be colorized • The value of a modified control is now displayed • Fixed a sync issue with Logic • Improved MIDI clock sync and Ableton Link accuracy • Fixed a bug where the matrix grid would not display correctly when it was updated too quickly • Fixed a bug where the state of the length marker link button was not preserved when the app was closed