Now it seems he was alone in his desire to work without a singer, and Guyader and Sastry have moved on. Marshall is working on a new Intervals album, which will feature Protest The Hero's Cameron McLellan on bass and former Periphery drummer Travis Orbin.

He had heart surgery earlier this year and reports he was always reluctant to move away from Intervals' all-instrumental roots. Marshall says: "In January 2015, I underwent heart surgery. I was rattled, to say the least. This was a very dark time for me, but all I could think about was how strong I was going to be when I came back, and how badly I want to make a new record.