6. The slim-key Jankó

The building process of the previous Jankó was a lot of fun and I was very happy with the result. Nevertheless, after playing it for a while, I noticed several problems with the key layout: For certain larger chords, some of the fingers needed to be stretched or bent quite uncomfortably leading to unergonomic hand positions. For example, as shown in the picture, for a major seventh chord with the…