i think serato is way behind on updating the video aspect of the software i've used virtual dj and learn you can mix with all four deck the 3 will act as the deck one and display the video as the fourth deck will act as the number two deck and transitions are better serato the 4.0 update sho;d've had a bigger updat to the whole software the 4.0 has my flx10 not showing the led lights when using the stem effects ive sent emails and dm on ig trying to get this resolved i don't like using it so i've been using virtual dj when i do a party or stream on twitch i actually used it in the club lastnight and it was flawless i've been with serato since it was scratch live and its like using a apple product its the same platform year after year stuck in the serato ecosystem and thats trash we need more then a libary update you have sold us this product and its been the same over and over well i can't stay around to watch the death of serato or have serato face the load time of a video compared to when i can have it resting on the next deck i hope you guys hear me when i say you are way behind you need tocatch up to the tech