Midi Step Polyphonic Arpeggiator

for iPad with iOS v8.0 or later

StepPolyArp is a real-time Midi arpeggiator to control Midi instruments, sequencers like Logic, Cubase, Live, and all other Midi sequencers, or even other virtual instruments installed on the same iPad. The arpeggiator can automatically generate melodic patterns from notes or chords played in real time.

Although, StepPolyArp is specially designed to operate in Midi, it has own internal sounds bank to use it independently.

Download on the AppStore

Download the documentation


  • Velocity, modulation, pan, volume, aftertouch and pitch bend step controller
  • Customizable step controller Midi datas
  • The arpeggiator and keyboard fit the selected scale
  • 6 arpeggiator modes
  • 1 random mode
  • 1 chord mode
  • Unlimited number of saves
  • Random patterns creation
  • Presets manager
  • iCloud and iCloud Drive support
  • Presets shared between computer and iPad using iTunes 9.1 or later
  • Presets available from "Files" application
  • Full support of "Split View" and "Slide Over"
  • 128 Undo/Redo levels
  • Lockable keyboard (latch mode)
  • 1 to 32 steps programmable matrix
  • 16 patterns by preset
  • Polyrhythm lines
  • Automatic chaining patterns
  • 11 configurable transposition lines
  • Features copy and paste
  • 8 octaves resizable keyboard
  • Multitasking
  • Internal sound bank
  • Tap tempo
  • Receiving Midi notes and control from external devices
  • External Midi sync (Midi Clock)
  • Midi over wifi latency compensation
  • 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 managing multitasking on the same device


Full Midi connection support

  • Midi over Bluetooth
  • Midi Wifi Network (RTP Midi)
  • Apple USB camera connection kit
  • Any Core Midi compatible interface
  • Virtual Midi ports
  • Ableton Link (sync)
  • Inter-App Audio (Midi, audio, sync, transport control)
  • Audiobus support (Midi, audio, transport control, state saving)

Play in time with Ableton Link

StepPolyArp includes Ableton Link technology that synchronizes beat, phase and tempo of Ableton Live and Link-enabled iOS apps over a wireless network.


SoundPrism Pro and StepPolyArp by ‪Audanika

This tutorial shows how StepPolyArp can be controlled via SoundPrism: MIDI notes are sent from SoundPrism to StepPolyArp, StepPolyArp generates an arpeggio and sends it back to SoundPrism.

Controlling an Oberheim FVS by Logan Mannstrane

The StepPolyArp iPad application hooks up wirelessly to a Windows or OSX computer. I currently have the StepPolyArp app talking with Logic Pro that then drives a Doepfer MCV24 to go from midi to CV and Gate. The Oberheim is being triggered in Unison for all 4 Voices on every step.

StepPolyArp on Apple iPad triggering Moog Little Phatty by Luis Duran

This time I sent the sequence live to a MOOG Little Phatty thats running thru a Freqbox, Ringmod, and a Bass Murf which in turn is passing thru the DAWs Direct monitor live with a u-he Filter with some delays and verb. Access Virus TI Polar is playing some pads in the back.

DSI Tempest with StepPolyArp by Linforlk

DSI Tempest with iPad (StepPolyArp). Only Sound DSI Tempest (Analog).


Presets can be saved to iCloud and available on all devices

"Want to get arpeggiating in Logic Pro? There's two main ways to set this up inside Logic... but wait, with an iPad you can get hands-on thanks to StepPolyArp app. Darren Burgos shows how."

Darren Burgos - macProVideo

"I really love this Arpeggiator... StepPolyArp is really really well thought out. You can create a Pattern (16 patterns available / Preset) very fast, create Accidents, Random, Automations (Velocity, Modulation, Volume, Pan, Aftertouch & PitchBend). 11 "tracks" are available on the grid (you can set their MIDI channel independently). Read the specifications at the end of this post. Watch also the video demo... A Killer App!"