I want to record some of my riffs, but they're a bit complex. They often change their speed, time signature (9/8-8/8 for example). How can I solve this in Sonar 7? I have to program the drums.
im pretty sure this is covered in the manual

anyway, in most daws this involves either inserting tempo markers in the timeline or in a "Tempo track" and adjusting their properties. if done correctly this will provide a grid of the correct time signatures for you to program the drums on top of.