A nice Jammy Guitar remix of Disco Ball by Matthew S. What is Jammy? Jammy is a gadget made to impress –it combines cutting-edge technology with a cool nostalgic look.The Jammy digital guitar is equipped with the adjustable tension interchangeable steel strings. It emulates different guitar techniques like bending, hammer-ons, pull-offs, slides, etc. Jammy’s 1/8″ and a ...