Array Z function or fasttracker style (music progr

I am doing a music program for fun. using array and run like the fasttracker style.

My questions are:

1)When you use a List Object and "0" (first line is selected) I create my actives(Like normal), when then I selected "1" (second line) the actives from "0" should be gone,(reset, but still in memory) so I can create new actives on each line in list object?

2)Just like in a tracker music program, where you create patterns?

3)How is this possible with the array object?

4) Are the Z dimention from array useful to this kind of styles?

5) Is it possible to create it with array?

I wanted to know if it's possble before I spend time on it.