Dual Envelope Generator + LFO
http://www.rolandus.com/products/system-500_540/
If you had an Unicorn Account you could see a chart with the price development of this module and the average price asked for this module.
Roland System 500 540 envelope for sale.
Module functions as it should and is in excellent condition. Comes with ribbon cable and original box.
Shipping in continental US included or local pickup. I am in Western MA.
I accept Paypal F+F or + 3% for G+S, venmo, zelle, or cash.
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