I bought the Helix rack sometime ago for my studio. We all know what an incredible machine that is! When I decided to purchase the Helix Controller I was surprised that no local retailer had it and in fact online retailers were out of stock and back ordered, but Sam Ash had it In Stock and on my doorstep in three days. The Helix controller is awesome and yes the Variax cable is the cable you need to hook it up to the Helix. It came with a cat-5 cable, but the Variax cable is much more sturdy and snaps in with a lock. I am very happy with my purchase from Sam Ash. Jordan was awesome and very knowledgeable and helpful, even calling me personally to follow up on the purchase. Line 6 is making great amp modelers now and if you have the Helix rack then I highly recommend the Helix control controller. Thanks Sam Ash.