Some customers who brought us musical instruments for repair or overhaul, asked us about the manufacture of analogue modules for modular synthesizers, since what is currently on the market, or are not very good, or are mostly digital modules, with very little in analogue. We have made some consultations and we have decided to open another department dedicated solely and exclusively to music synthesis. It will be called ATM-Music. We have dusted off the old analogue module schematics that we used in the 80s, we have taken out the drawers of old components that we had in storage and we are going to dedicate ourselves to making modules for modular synthesizers based on the Eurorack standard system. We’ll start with some introductory theory on music synthesis and synthesizers and their modules.