MIDI Step Polyphonic Arpeggiator For The iPad

iPad Music Software: Laurent Colson’s StepPolyArp (App Store link) is a midi step polyphonic arpeggiator. The arpeggiator does not play any sound itself, it transmits midi notes to a Mac or a PC to be used in combination with any sequencer, virtual instrument (VSTi, Audio Unit) or midi synthesizer.

The arpeggiator can transform chords into sequences of notes played one after the other in several ways. A matrix polyphonic step modulate arpeggiated notes in time and pitch. The main controllers (velocity, modulation, panning, volume, aftertouch, and pitch bend) are also programmable through a step editor. The integrated keyboard automatically adapts to the selected musical scale.

StepPolyArp is available now for $11.99. See details below.

If you’ve used StepPolyArp, leave a comment!


  • 32 steps programmable matrix
  • 11 configurable transposition lines
  • Features copy and paste
  • 8 octaves virtual keyboard
  • Velocity, modulation, pan, volume, aftertouch and pitch bend step controller
  • The apeggiator and keyboard fit the selected scale
  • 6 arpeggiator modes
  • 1 chord mode
  • Unlimited number of saves
  • Random patterns creation
  • Presets manager
  • Presets shared between computer and iPad using iTunes 9.1 or later
  • 128 Undo/Redo levels
  • Lockable keyboard (latch mode)

Supported midi connections:

  • DSMidiWifi (free)


  • A computer running Mac OS X, Windows Vista or Windows 7
  • DSMidiWifi server (free) installed on the computer for wireless midi connection
  • A sequencer installed on the computer (Logic, GarageBand, Cubase, Ableton Live, Digital Performer, Reaper, ProTools, Sonar, Studio One, …)
  • An iPad with iOS v3.2 or later

4 thoughts on “MIDI Step Polyphonic Arpeggiator For The iPad

    1. My reaction, too. I'm really tempted to get one of those MIDI Mobilizers, but right now there are only a couple of apps that support it.

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