majalan

Copperbox revision 3251.

I've moved the ET12 pitch modules into their own namespace and renamed the Base.PitchString module to Base.Melody.  

Base.Melody now allows rests in the pitch string, my expectation is that this will let it represent more "musically useful" sequences without being burdened by note duration - all notes in a melody are unit length until they are transposed with a beat pattern or impulse map.