Analog and digital circuits for electronic music instruments, especially, but not only for Theremins.
The Nextion MIDI I/O adapter, designed by me 2022 in France, is now produced and sold by Itead Intelligent Systems in Shenzen/China.
Some of my popular add-on modules like the EPVM1345 (created in 2008) and the ESPE01 (created in 2009) which I designed for the Moog Etherwave Theremins are produced and sold by ethermagic.eu in the Netherlands.
Prototype for a pure analog Theremincello (cabinet and controls machined by Augusto Triani). It was sound-wise highly acclaimed at the Cello Festival in Dordrecht/NL in 2013.