To give you an impression about the creation process of ChordProgressor,
here is a collection of screenshots, which show some levels
of the development of CP's surface which reflects on its grown functionality as well.

After building some of the groundworks under the hood, this is the very first 'raw like sushi' surface version of CP.

The following screenshots show different stages of ChordProgressors development,
their capture is not evenly timed though, so this is not like a diary.