New iPad Drum Machine, S4 Rhythm Composer Pro

sobol-s4-rhythm-composer-proDeveloper Sobol Corporation has released S4 Rhythm Composer Pro – an iOS drum machine app that can be customized in various ways.

The virtual drum machine includes 14 drum kits and you can create and save User Kits. It includes a 16/32 step Step Sequencer and Song editor, tone editing, audio import/export, real-time recording, AudioBus, CoreMIDI and more.

Here’s the official intro video:


  • PCM Sound (Number of parts: 10)
  • 14 preset drum kits
  • Tempo: 30-300BPM, Tap tempo, Swing function
  • Step Sequencer (16 steps/32 steps)
  • Song function (Maximum 300-bar)
  • Tone editing (Name, Volume, Panning, Mute Group, Tune, Dynamic Processor, Wave Trimming, Attack/Decay Time)
  • Audio Import (AudioCopy, iPod Library, File)
  • Audio Export
  • Real-time recording
  • Various Master Effects (Distortion, Dynamic Processor, Delay, Reverb)
  • Control in real time, assigning the effect parameters to the FX XY Pad
  • Real-time Effects (Slicer, LPF, Glitch, and Roller)
  • WIST (Wireless Sync-Start Technology) is supported
  • Audiobus (Input) is supported
  • CoreMIDI (Input) is supported
  • AudioCopy/Paste is supported
  • Playing in the background is supported

S4 Rhythm Composer Pro is available now for US $4.99.

If you’ve used S4 Rhythm Composer Pro, let us know what you think of it!

3 thoughts on “New iPad Drum Machine, S4 Rhythm Composer Pro

  1. Just picked it up. Having played with it for a few minutes, I find the Roller, Glitch, and Slicer to be novel additions to an iOS drum machine. Usually you’d be slicing things up in GlitchBreaks or Samplr, Turnado, etc. So, that’s nice. No real complaints yet. If I find anything horrible, I’ll chime back in.

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