this is similar to the other topic... please try to keep all the same issues in one thread since it's easier to follow and give you the advice you seek.
Song blocks? Do you mean the audio loops?
The loops of both audio and midi are drag and drop or double click to add them to a track. Click the track to make it active and click to add the clips/loops at the now point. You can "grab" the end of the loop with your mouse and drag it out further in the time line to continue the repetition of the loop.
As I said earlier I don't work much with loops but I did construct a song once just to try to learn a few things about them.
What sound card are you using and what computer and OS? I assume you have MC6 as well?