It's inspired by trackers, but has fewer limitations and uses graphics to show musical data.
The advantages of this interface compared to piano rolls (the normal sequencer interface), are that note editing is quicker, and that more musical data fits on the screen.
The advantage of this interface compared to trackers, is that note positions and effects are edited graphically, which is both quicker, provides more vertical space, and gives a better musically overview.
However, despite it's unusual appearance, it's a design goal for Radium to be straight forward to use, and easy to learn. It should not be harder to learn Radium than any tracker or most midi sequencers.

Homepage: http://users.notam02.no/~kjetism/radium/
Some of the changes between 1.9.3 and 1.9.22:
* Improved graphics
* Waveforms are shown in the tracks
* Various improvements to the sampler instrument
* Automatic crash reporter. A dialog shows up asking you to send an automatic bug report if Radium crashes.
* A bunch of bug fixes.
* Radium can be used as midi synth
Full changelog: https://github.com/kmatheussen/radium/b ... /Changelog