Mix Effects Board for DVS-9000 Switcher. This board adds one Mix/Effects Bank to a DVS Processor. A Maximum of four BKDS9210 boards can be added to a single DVS9000 processor (2 for the DVS9000SF). The DVS9000 comes standard with 2 Mix Effects boards (1 with the DVS9000SF). Each Mix Effects bank comes fully featured with 4 keyers, all types (luminance, linear, chroma, etc.).