I was asked a while back if I could use some screen-capture software to demonstrate the software... I have uploaded a (relatively) small file (2.4MB) that shows me dropping various blocks (MOVE, WAIT, LOOP, SWITCH, etc.) and how things resize.
There's no sound, but I think this gives you a good idea of how the LOOP resizes and how the blocks are dragged and dropped.
You can see the file here. Save it to your hard drive (NXTSW.exe) and give it a view.