Version 1.8 will be coming soon!


Virtual Analog Drum Machine

VADrumSM is a standalone mobile drum machine featuring a virtual analog drum synthesizer and a step sequencer. The virtual analog drum synthesizer supports AUv3 Audio Unit extensions, which allows users to use the drum synthesizer inside of AUv3 hosts, such as Apple’s GarageBand®. The step sequencer supports Ableton Link which allows users to synchronize the sequencer to Link-enabled apps and devices.

Drum Synthesizer

The drum synthesizer is inspired by the iconic analog drum machines of the 1980’s and features 21 drum voices. Sounds of the each drum voices are synthesized in real time by using component level modeling. Unlike sample playback, each hit sounds subtly different just like the sound of the analog drum machine.

Step Sequencer

The step sequencer is designed to be intuitive and easy to program drum sequences. It is a 16 step sequencer. There are 3 accent level for the each step. Double hit mode allows to program two 32nd notes instead of the one 16th note. There are 4 patterns and can be chained to create 4 bar loop. There are 6 variations of swing, which can be applied in real time.

Parameter Automation

All XY parameters (tone, level and pitch) and voice switches can be automated, that gives a whole new sonic possibility. Recorded automation can be overridden or overdubbed.

XY Pads

The XY pads are parameter controllers and drum pads. You can trigger drum sounds with different parameters in each time and triggered notes can be recorded wth the parameters for automation. Trigger can be turned off to only control parameters. Lock mode provides traditional drum pads functionality.


Drum Synthesizer

  • 21 analog modeling drum synthesizers, including 2 bass drums, 2 snare drums, 2 sets of low, mid and high toms, low, mid and high congas, rim shot, claves, hand clap, maracas, closed and open hi-hats, cymbal and cowbell.
  • 3 Layers of 16 XY parameter controls (Tone, Level and Pitch)
  • Drum Pads Mode (Lock)
  • Trigger Mode (On / Off)
  • 5 Voice Selectors
  • MIDI input (mid note events only)
  • Support Audio Unit Extensions (AUv3)

Step Sequencer

  • Parameter Automation
  • Swing: 6 variations
  • Accent: 3 level
  • Double hit: on / off
  • Patterns: 4 patterns
  • Pattern Length: 1 bar
  • Loop length: 1 bar or 4 bar
  • Steps: 16 steps
  • Note length: 16th or 32nd
  • Record quantization: 16th
  • Tempo: 20 BPM – 999 BPM
  • Chain mode: on / off
  • Support Ableton Link

* Ableton Link requires Wi-Fi connections.

  • *Apple, Mac and GarageBand are trademarks of Apple Inc., registered in the U.S. and other countries.
  • *Ableton and Link are trademarks of Ableton AG.


Sound Engine

Analog Modeling Synthesizer

Instrument Voices

21 total


16 steps, 4 patterns, loop length: 1 bar or 4 bar


  • Standalone:   MIDI note events input (Note on and Note off)
  • AUv3: MIDI note events input and output (Note on and Note off)


  • Support Audio Unit Extension (AUv3)
  • Support Ableton Link

*Appearance and specification of products are subject to change without notice.


VADrumSM User Guide (V1.7) [PDF]

VADrumSM is available now from the Apple App Store.

Release Note

Version 1.1

  • Support preset functionality 
  • Support user presets (iOS13 / iPadOS)
  • New “Lock” Mode
  • Support Dark mode (iOS13 / iPadOS)

Version 1.2

  • New design, improved user interface

Version 1.3

  • Added 16 step sequencer
  • Support Ableton Link

Version 1.4

  • Performance improvements and bug fixes
  • Improved timing of the sequencer

Version 1.5

  • Performance improvements and bug fixes
  • Added swing settings to the sequencer.
  • Accent mode has changed. Now you can choose three level of the accent.
  • You can set accent mode and double mode for recording.
  • Loading user preset can be quantized.
  • Improved timing of MIDI input and output
  • Overall bug fixes including bug fixes on iPhone and bug fixes on iOS12.

Version 1.6

  • User Interface improvements
  • Performance improvements and bug fixes

Version 1.6.1

  • Fix a bug for crash at launch reported by crash log

Version 1.7

  • Added parameter automation
  • Improved usability of the side panel table
  • User Guide is included and can be viewed within the App.
  • Performance improvements and bug fixes
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