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Latest commit 2db8f6b @mauser mauser Merge pull request #327 from blablack/button_press_hold
Button press hold bug fix

Hydrogen Drum machine

Hydrogen is an advanced drum machine for GNU/Linux, Mac and Windows. It's main goal is to bring professional yet simple and intuitive pattern-based drum programming.



  • Very user-friendly, modular, fast and intuitive graphical interface based on QT 4.
  • Sample-based stereo audio engine, with import of sound samples in wav, au and aiff formats
  • Support of samples in compressed FLAC file.

Sequencer and mixer

  • Pattern-based sequencer, with unlimited number of patterns and ability to chain patterns into a song.
  • Up to 192 ticks per pattern with individual level per event and variable pattern length.
  • Unlimited instrument tracks with volume, mute, solo, pan capabilities.
  • Multi layer support for instruments (up to 16 samples for each instrument).
  • Sample Editor, with basic cut and loop functions.
  • Time-stretch and pitch functions via rubberband cli.
  • Playlist with scripting support
  • Advanced tab-tempo
  • Director Window with a visual metronome and song position tags
  • Timeline with variable tempo
  • Import/Export single patterns
  • Midi-Learn functionality for many gui elements
  • Multiple patterns playing at once.
  • Ability to import/export song files.
  • Unique human velocity, human time, pitch and swing functions.


  • JACK, ALSA, PortAudio and OSS audio drivers.
  • ALSA MIDI and PortMidi input with assignable midi-in channel (1..16, ALL).
  • Import/export of drumkits.
  • Export song to wav, aiff, flac or file.
  • Export song to midi file.

Installation: See the INSTALL.txt file.


Happy drumming! :^)

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