Eurorack is a modular synthesizer format originally specified in 1995 by Doepfer Musikelektronik.[1][2][3][4] It has since grown in popularity, and as of 2022 has become a dominant hardware modular synthesizer format, with over 15,000 modules available from more than 1000 different manufacturers ranging from DIY kits and boutique, cottage-industry designers to well-known, established synth mass-manufacturers like Moog and Roland.[5][6][7]