The Panasonic MX50 is the default professional video mixer.

Features

4 sources can be switched and any 2 of them routed to the program buses
Compatible with a wide variety of video editing devices
GPI input.
Fade colour can be selected from white, black, and the matte colours
Preset special-effect and wipe-pattern combinations
A total of 287 wipe patterns are available, plus a scene grabber
Master recording output can be selected with the effect switch
Spotlight effect enables the screen to be dimmed except for a selected area
Up to eight of the most commonly used original programs can be stored as presets
Two-channel digital frame synchronization permits special effects in each of the A/B program buses
A/B program buses can be monitored at the A/B program outputs while the mixed picture is monitored at the preview output
Digital chroma, luminance, and down stream keys with overlap mix facilitate complex image-processing
Up to four audio sources can be mixed, including a post-recording audio mic input
Video, audio, and superimpositions can be simultaneously or separately faded in and out
Backup function retains programs for approximately one week with no external supply