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

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

General

* Very user-friendly, modular, fast and intuitive graphical interface based on QT 3.
* Sample-based streo 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 64 ticks per pattern with induvidual 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 and swing functions.
* Multiple patterns playing at once.

Other

* OSS and Jack audio drivers, with assignable Jack ports.
* ALSA MIDI input with assignable midi-in channel (1..16, ALL).
* Import/export of drumkits.
* Export song to wav file.
* Export song to midi file.