As you have figured out by now the Composer's main weapon is the robotic arm, which moves in various ways and picks-up the empty/burned/printed CDs. Let's see how the robotic arm's movements work. Below is a diagram which shows what is the logic behind the movements of the robotic arm:

Yes I know that you probably have understood the above diagram but let's also see how the system works with many pictures ;)

1st Phase: Pickup the CD from the "Input Bin":

In this phase the robotic arm moves above the "Input Bin", lowers down and grabs an empty CD.

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2nd Phase: Move above the empty CD tray and place the CD:

In this phase the robotic arm moves to the right above the opened CD tray. It stops, lowers down and finally places the CD in the empty tray. The CD tray closes and the burning starts. If in the same time you are printing a CD then the robotic arm moves back to the center in order to pickup the printed CD and move it in the "Output Bin":

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3rd Phase: Pickup the burned CD and move it in the CD Printer/Output Bin/Reject area:

After the CD burning procedure the CD tray opens, the robotic arm lowers down, pickups the CD and moves it either to the center (CD printer) or directly in the "Output BIN" or in the reject area (if the CD is bad).

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