Durante os seus cursos de Arte Sónica no Saint Louis College of Music em Roma (2007-2009), sob a orientação de Luca Spagnoletti, Leonardo desenvolveu um instrumento virtual chamado Caixa 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 (harmónicos puros). Esta abordagem permitiu-lhe criar texturas ocas, tipo pad, tão livres de batimento quanto possível, bem como sons percussivos simplificados e limpos.

O 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 Ariae Leomode.