{HH} From Jan-18: Mentions a single (one-to-one) coupling of the five channels (perhaps so that speaker and ultra-sound are distanced or pointing into different directions)

Körper α:

Sketches

{HH} From Feb/Mar-18: Ocellated speakers, ultra-sound mounting, cables falling to the ground

{HH} From Apr-18: Five- versus two-dimensional GNG