- Roland Systems Group announces the EDIROL MVS-12 Multi-Viewer/Switcher which groups and displays up to 12 SD video signals to a single HD or RGB monitor. This multi-viewer is the a companion for the line of EDIROL SD video mixers such as the LVS-800 and V-8. The MVS-12 is ideal for any applications where you need to preview multiple video sources at once such as worship, school, corporate, and event applications. The MVS-12 eliminates the need for individual preview monitors, combining 12 SD inputs into one LCD display. In addition to the Multi-Viewer function the MVS-12 has a built-in matrix switcher allowing up to video sources to be routed to up to four separate outputs.