Confession: I've never owned, nor played, a Boss DS-1. That changes today. Pics coming, but, uh, you know what it looks like. Really, the main reason I bought it was to achieve a more smooth, balanced distortion for lead lines than the gritty crunch the Marshall's red channel provides. The OCD is an awesome low-gain drive, but it definitely has that soft-clipped, mid-boosted thing going on. The DS-1 is harder clipped, and has a scooped character. Together, the two mix really, really for a heavily saturated, but not necessarily heavy, tone. Fun times ahead.