Here is an FR I posted some time ago. It could be a
versatile MIDI filter and manipulator, which somewhat is leaned on Cubase's Logical Editor. It contains a simple groove editor as well and possibilities to fill items with single notes (or other events) and/or arpeggios. The graphical interface, however, might not be that appealing since it is based on the early V3 MIDI editor, where there was much unused space at the top of it (the space that now holds the toolbar).
-Data