SYSTEM-500 521

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. Controllers:SIGNAL IN 1 sliderSIGNAL IN 2 sliderSIGNAL IN 3 sliderMODULATION IN 2 sliderMODULATION IN 3 sliderHPF switchFREQUENCY knobRESONANCE knob Connectors:SIGNAL IN 1 jack: Miniature phone typeSIGNAL IN 2 jack: Miniature phone typeSIGNAL IN 3 jack: Miniature phone typeOUT jack: Miniature phone typeKEY IN jack: Miniature phone typeMODULATION IN 2 jack: Miniature phone typeMODULATION IN 3 jack: Miniature phone type http://www.rolandus.com/products/system-500_521/