COALPI

So i have a tt sync controller and i have plugged a Thermaltake Floe Riing 360 TT Premium Edition and 3 Riing plus 14 fans.I also plugged in all 3 pwm cables.I am controlling the lights with msi mystic light.So now the problem: my fans are set at about 1400-1600 rpm and i want to lower the rpm because it s a little to loud. I enter the bios and i can see there the fans speed,but when i try to change it nothing happens and it stays the same. Please i need help ! In total i have 3 fans from the cooler the cooler pump and another 3 riing 14 fans