DDJ - RB no master level

Hello guys! I have a problem, i have connected my ddj-rb to computer and i have speakers connected into computer, and everything works fine, headphones and speakers but my master level is dimmed i cannot control master level with controller at all, like its unfunctionable, i've put my settings to ASIO and its dimmed, when i put to speakers from computer(in prefferences)than i can control master level but my headphones are not working, please any help or fix for this, i really need master level, first of all when i can't use my master level on ASIO Driver my speakers are way too quiet and when i can use it I actually hear better and get better sound and I also firstly learned mixing on master level, now i can't use it and it frustrates me. I've also tried to put in midi mode master level, but when i import it says ( not functionable ) i don't know why, in friday i have house party cca 40 people and i will need master level for better atmposhere and higher amount of volume coming through speakers, i don't wanna trim on 5+ cause its not good for my controller and soundcard.. So please anyone give me fix for this as quick as you can guys, greetings!