I simply don`t understand what your problem is. Could you please be more specific?
What do you mean with “C6 Does’nt export all tracks”?
Can someone explain to me what “export in realtime” means? Recording directly onto another medium?
As the name implies, it´s an option to export your mix in realtime as opposed to offline. If you take a closer look at the export dialog, you may find the checkbox. It´s not available in all versions though since you´re not specific enough concerning your used version, you may want to check your manual…