Hydrogen is an advanced drum machine. It's main goal is to bring professional yet simple and intuitive pattern-based drum programming.

General features:
* 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 features:
* Pattern-based sequencer, with unlimited number of patterns and ability to chain patterns into a song.
* Up to 64 ticks per pattern with individual level per event and variable pattern length.
* 32 instrument tracks with volume, mute, solo, pan capabilities.
* Multi layer support for instruments (up to 16 samples for each instrument).
* Ability to import/export song files.
* Unique human velocity, human time, pitch and swing functions.
* Multiple patterns playing at once.

Other features:
* 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 file.
* Export song to midi file.