2. To avoid having to regenerate, you can also manually change the output channels for each generated track. Click on the light-blue(or White!..) audio channels label to the far right of each track. Change the output channels to Stereo Out->1-2 (St->1-2). On the VST panel

MusicStudent

are all your individual tracks set up as stated above? and are all the tracks active. Also if you press "S" button on each track do you hear only the selected track?