How many channels can WAGS2 handle?

WAGS2 is designed to be a two channel system, sending out one channel for overlay graphics (lower thirds, keys, etc..) and a second channel for full screen and background graphics and media. The normal setup for this requires a four channel Blackmagic Design Decklink card. Three channels are used for output (key, fill, and full screen), while the fourth is used for external video input.