- Behringer System 55; Eurorack Modular-System; contains the modules 914 Fixed Filter Bank, 923 Filters, 904A VC Low Pass Filter, 904B VC High Pass Filter, 992 Control Voltages, x5 902 VCA, x4 911 Envelope Generator, x2 921A Oscillator Driver, x6 921B Oscillator, 921 VC Oscillator, 950 Sequential Controller, CM1A MIDI-CV Interface, x3 CP3A-O OSC Controller, x3 CP3A-M Mixer, x2 995 Attenuators, 903A Random Signal Generator, CP35 Attenuators, 961 Interface, 962 Sequential Switch; x2 Eurorack Go case with power supply; x2 Eurorack Go Brackets to link two Eurorack Go cases; including blank panels BP28, BP56 (x2) and BP2 (x2); 144 HP of free expansion space for other modules