Based on the classic SYSTEM-100M modular synthesizer, the SYSTEM-500 is a fully analog recreation of one of the most revered electronic instruments of all time. Newly designed in Eurorack format, the SYSTEM-500 delivers the classic character and functionality of the original with the advantages of a modern instrument. Built in the USA and assembled in Japan, the SYSTEM-500 is made to exacting standards with top-quality components and solid controls. And it’s surprisingly affordable, turning the fantasy of finally owning this legendary instrument into reality. Classic System. New Format. The SYSTEM-500 consists of Eurorack format modules that you can mix and match in any combination to create the ultimate Roland modular synthesizer. Each module is completely analog and has been designed for maximum compatibility with the world of contemporary synthesizer and effects modules. The SYSTEM-500 is a compact, powerful system that opens up vast possibilities for sound design and musical exploration. 521 Dual VCF The 521 Dual VCF (voltage controlled filter) module features two separate low pass filters for modifying the timbre of audio sources. Each filter has its own dedicated controls for frequency cutoff, resonance, and a fixed high pass filter with two switchable cutoff points. Audio and CV input mixers on each channel allow the blending of multiple audio signals and modulation sources.