asymmetrical clipping

It produces both even and odd harmonics, resulting in harmonically rich distortion that sounds layered¹. Players often describe it as smoother, more natural, and tube-sounding², or as richer, more open, more dynamic, and more amp-like³. Compared with symmetrical clipping, it can deliver more punch, a wider feel, and slightly less compression⁴. It appears in pedals such as the Boss SD-1 and OD-1¹⁵.