Custom shapes and custom waves each have variables which allow the author to change the shape, size, color, and location on screen, among other things. Shapes and custom waves each have internal per_frame code that affects these variables similarly to how per_frame equations affect the entire preset. Custom shapes and waves equations are included in MilkDrop version 1.04 and later. While initially MilkDrop allowed four custom shapes and waves, the latest version of the MilkDrop beta allows up to five custom shapes and five custom waves to be utilized per preset.