AsimCDFS handles changers nicely and is the only one that does easily. You can download the adf file for version 3.7 or 3.9 from EAB's server, and a copy may be on
http://www.the oldcomputer.com. These use the LUN's of the device number and thus are limited to 7 discs, so the LUN must be enabled on those controllers that allow it (the 4091 & 2091 do). One could also write individual mountlists for each unit to select it. The DVD aspect may be an issue depending on the format as only some are recognized.