The E-mu Modular System is an analog modular synthesizer built by E-mu Systems in 1974.[1] It competed with synthesizers such as the ARP 2500, ARP 2600, and Moog modular synthesizers, although E-mu designed the instruments for mostly universities and notable musicians who submitted custom configuration requests. The Modular System's polyphonic keyboard and sequencer are controlled by a microprocessor. Around 100 units are thought to exist today.