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. 

The 540 features two ADSR envelopes with regular and inverted outputs and manual push button for triggering.  Also features a voltage controlled LFO with "delay" control - When either envelope is triggered and the delay switch is set to that envelope, it will temporarily silence the LFO and fade it up to full level over the period of time set by the delay knob - perfect for delayed vibrato and other classic roland effects!

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.