Probably a newbie question: I'm using Studio Drummer in Kontakt Player 6 in Cakewalk by BandLab. It is working fine, but when I try to change the mix in the Close mics mixer nothing happens. Neither the sliders nor the Mute and Solo buttons work. When I select a mixer preset the slider positions change and the sound changes accordingly, but when I drag a drum or cymbal slider nothing happens soundwise. What may I have done wrong?