DDJ label has two series
DDJ001... 002... 003... 004 and so on
and
DDJ01S... 02S... 03S... and so on
The first release of the series is DDJ001
DDJ01S came after 8 releases and is a code didicated to synchronizations, "S" is for synchronizations.
We will be starting also a third code which will be DDJ01DLX and will be dedicated to more complex projects.
Cheers!
Daniele