Rio Grande Mix: Above, Trevor Rabin in his studio, already thinking about his next surround-sound mixing endeavor. Photo by Hristo_Shindov. Trevor Rabin is all in on leaping directly into the Atmos-mixing universe, having immersed himself in composing in surround sound for the 50 or so films he’s scored over the past three-plus decades. “It seems like yesterday, not 30 years—but in that time, 5.1 just became second nature,” he confirms.