Während seiner Sonic-Art-Kurse am Saint Louis College of Music in Rom (2007-2009) entwickelte Leonardo unter der Leitung von Luca Spagnoletti ein virtuelles Instrument namens Akkord-Box, 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 (reine Obertöne). Dieser Ansatz ermöglichte es ihm, hohle, pad-ähnliche Texturen zu schaffen, die so frei von Schlägen wie möglich waren, sowie vereinfachte und saubere perkussive Sounds.

Die 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, Per Ariaund Leomode.