http://www.pioneer-eur.com/eur/content/support/support/software.html Try the Quiet drive utility - if it works, you have an A09 or other XL-class version, if it doesn't, you have a 109 or awkward OEM version.
The A09 is identified as a DVR-109 to the system, so that writer software doesn't need an extra ID for it, and hacks to switch the 109 to the Quietdrive enabled A09 firmware, or the full bitsetting Buffalo firmware, are all over the place - no, you cannot have Quietdrive and full bitsetting together.