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.

Official Website: http://www.hydrogen-music.org

• Very user-friendly, modular, fast and intuitive graphical interface based on QT 5.
• Sample-based stereo audio engine, with import of sound samples in wav, au and aiff formats
• Support of samples in compressed FLAC file.
• Separate commandline interface (h2cli)

• 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 tap-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, PulseAudio, PortAudio, CoreAudio and OSS audio drivers.
• ALSA MIDI, JACK MIDI, CoreMidi 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.
• Export song to LilyPond format.

More details in the INSTALL.md file.

GPLv2 (more details in the COPYING file.)

Happy drumming! 😃