hey i resolved thei ssue, switch was set to phono not computer on each channel on the mixer.
PS. do NOT listen to rekordbox support, they lied to me and said 'even though you paid for DVS on Rekordbox 5, it won't work on Mac Ventura, i need to pay for Rekordbox 6. IT WAS A COMPLETE LIE, dvs still works perfectly on 5 on Ventura. Shame on them for trying to upsell me when I already spent loads of money buying licenses that worked perfectly fine.