Hello Marc,
the Adobe series of software supports teh raw format of many digi backs and "generic" DNG, so does Raw Developer.
Aperture doesn't.
Apple claims to support DNG, but when you read the small print, you will notice that they only support DNG files of devices which have a raw format supported by Aperture.
So it is of no help to used Adobes DNG converter to convert any digi back file to DNG, because Aperture will not be ablte to handle it, despite the fact that the DNG file format is designed as a device independent format.
When time comes, Aperture might support digi backs, but this time isn't today.
Regards
Stephan