The 530 Dual VCA (voltage controlled Amplifier) features two independent voltage controlled amplifiers for controlling the loudness of audio signals. Each VCA has it's own 3 channel input mixer with three sliders , each VCA has three CV inputs with sliders for depth, and the VCAs feature a selector switch for linear or exponential response modes.  Super handy!

Note: This is a used item, and while it is guaranteed to be fully functional it is almost sure to also contain "rack rash" on the mounting holes and have some minor scratches on the panel from use. It will include a ribbon cable, m3 screws, and a box, but not the original box.