Durante sus cursos de arte sonoro en la Escuela Superior de Música Saint Louis de Roma (2007-2009), bajo la dirección de Luca Spagnoletti, Leonardo desarrolló un instrumento virtual llamado Caja de acordes, built using Native Instruments Reaktor.

Motivated by the pursuit of a “pure sound,” this instrument bypasses equal temperament, instead generating sine waves with frequencies calculated according to exact harmonic ratios (armónicos puros). Este enfoque le permitía crear texturas huecas, tipo pad, tan libres de golpes como fuera posible, así como sonidos percusivos simplificados y limpios.

En E-Jazz project focused on combining pre-programmed sequences created with this instrument and live piano performances, representing Leonardo’s first true approach to experimental music.

Later, with the help of Eduard Resina Bertran, head of the Creation and Music Theory Department of the Escola Superior de Música de Catalunya (ESMUC), Leonardo developed a real-time playable version using Max MSP. This version was later used in several other projects, including Art.eria, Por Ariay Leomode.