Comment 12 for bug 872006

If Mixxx were to adopt a traffic light system for key matching (relative the existing 'current track' mechanism or a drop-down menu/MIDI selection/whatever), I think it would make further sense to also signify tracks to the user that would work harmonically after a small pitch-change.

Maybe the key cells of truly harmonicly compatible tracks could have the standard traffic light look, and tracks that would need a semitone nudge would have just a thick border of the colour around the cell edge, and ones that need a full tone change would have a very thin but still noticeable border?