S4 Rhythm Composer
This is a Virtual Analog Synthesizer duplicating Analog Synthesizer.
4-Voice Polyphonic Synthesizer.
Available on the App Store
ReleasedDec 15, 2012
Size10.2 MB
RequirementsCompatible with iPad. Requires iOS 5.1 or later.

Version information

Version 1.1

  • Improved the audio engine
  • Added factory presets (64 tones)
  • Added Panic button and Hold button
  • Supported background playback
  • Also, fixed bugs, made some improvements, and enhanced the stability


Eurypharynx Eurypharynx Eurypharynx

Eurypharynx is a 4-Voice Polyphonic Virtual Analog Synthesizer.
Basically it models features after Analog Synthesizer.
But more importantly, it combines the following five remarkable features.

  • In each OSC, you can select two waveforms and also morph them.
  • In Flexible patching operation is available with Matrix Patching.
  • In Alter numerous parameters sequentially with Modulation Sequencer.
  • In Intuitive performance is available with XY Pad Control.
  • In It is possible to save up to 256 patches.


Implemented Features:

  • 4-Voice Polyphony
  • OSC x 2 / NG x 1
  • OSC Modulation
    • Ring Modulation
    • OSC Sync
  • Glide
  • Filter x 1
  • EG x 2
  • LFO x 2
  • Arpeggiator Type x 6
  • Matrix Patching
  • Modulation Sequencer
  • XY Pad Control x 2
  • FX
    • Delay
    • Chorus
    • Over Drive
  • Keyboard (Scale) x 35
  • Real-Time Recording


  • Wireless Sync-Start Technology (WIST) is supported.
  • AudioCopy is supported.
  • CoreMIDI is supported.


This app is compatible with Core MIDI; you can play and control with your external USB MIDI device connected to Apple iPad Camera Connection Kit.

Precaution for Use

  • MIDI channel 1 is set for Eurypharynx.
  • USB MIDI devices are connected via Apple iPad Camera Connection Kit (sold separately).
  • A self-power USB hub may be required for connecting USB MIDI devices with high power consumption.
  • Set various MIDI settings at your USB MIDI device.

read more -> eurypharynx_midi.pdf