VIRTUAL GIFT CARD, DELIVERED ELECTRONICALLY. What do you get someone who’s into synthesizers and electronic music instruments? A gift card for Control Voltage is a great place to start! An official Control Voltage Gift Card is good for anything in our shop, can be used on our web site or in our showroom in Portland, Oregon and never expires. PLEASE NOTE: Gift card purchases are non-refundable & as soon as the order is completed, the gift card code will be sent to the recipient's email.