3.2 The numbers at the beginning of each model denote the width (left to right) of the workstation.  The 3.0 is 3 racks wide.  The 3.2 is 100mm = 4" wider than the 3.0 and correspondingly the 2.8 is the same amount smaller
SS The SS denotes a single shelf workstation configuration.  It has a single bridge shelf above the desk.
DS The DS denotes a double shelf workstation configuration.  It has a bridge shelf and also a top shelf above the desk
Bridge Shelf The shelf above the desk is described as the Bridge Shelf because it forms a bridge over the work surface.
Synth Station The Synth Station configuration provides both a sliding desktop and a sliding synth shelf below.
Studio Desk The Studio Desk configuration provides a single fixed desktop