Hydrogen is an advanced drum machine for GNU/Linux, Windows and Mac OS X. It's main goal is to bring professional yet simple and intuitive pattern-based drum programming.
I used Hydrogen for several years and is real good, but it can run the last versions in Windows XP, Why?
It ask me for some .dll that is in the /system32/ folder but seems hydrogen does not recognize it.
Pros
Simple, expansible and open source
Cons
Not running in windows XP from version 1.0 and later.
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