Hydrogen is a software synthesizer which can be used alone, emulating a drum machine based on patterns, or via an external MIDI keyboard/sequencer software.
It features a modular and graphical interface based on QT4, has a sample-based stereo audio engine, with import of sound samples in PCM formats. Furthermore, a pattern-based sequencer with the ability to chain patterns into a song. Up to 64 ticks per pattern with individual level per event and variable pattern length are possible. 32 instrument tracks with volume, mute, solo, pan capabilities are provided, and there is multi-layer support for instruments (up to 16 samples for each instrument). Human velocity, human time, pitch and swing functions are implemented as well.
| Package Version | Update ID | Released | Package Hub Version | Platforms | Subpackages |
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| 1.1.1-bp155.1.9 info | GA Release | 2023-05-22 | 15 SP5 |
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| 1.0.2-bp154.1.113 info | GA Release | 2022-05-12 | 15 SP4 |
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| 1.0.1-bp153.1.18 info | GA Release | 2021-03-06 | 15 SP3 |
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| 0.9.7-bp152.3.18 info | GA Release | 2020-04-17 | 15 SP2 |
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| 0.9.7-bp151.3.2 info | GA Release | 2019-07-17 | 15 SP1 |
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| 0.9.7-bp150.2.1 info | GA Release | 2018-08-13 | 15 |
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| 0.9.7-bp150.2.3 info | GA Release | 2018-07-30 | 15 |
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