In 'Und so weiter pour piano électrique et bande magnétique', the piano and tape sounds become interwoven in a complex dialogue. 'Music Promenade. Mixage originale" - created in two periods: the period of recording from 1964 to 67 and the period of mixing and editing from 1966 to 68 - describes a magnetophonic memory trip through several years in which Ferrari recorded everything that attracted his attention.