Pioneer 109 features clarification

To expert people…if possible

  1. DVR-109 is a drive with new OPC feature?
    because I have not seen that mentioneted anywhere…

  2. the buffer fluctuation in Nero (and others things as laser stops burning for a while then back on again and so on) are related to that?

  3. Surely it is not only related to Z-CLV burning, because it happens also when it burns 2x that is only a CLV burning strategy…Do I say right?

  4. Is there a different behavior among firmwares?

…To clarify these issues…what is the correct function of DVR-109 ?

Thank in advance