VSL Special Edition Collection Vol. 1 Plus License, Orchestra Library, extends the articulations of Strings, Brass, and Woodwinds of Vol. 1, short détachés, fortepiano, Bartók-Pizzicato, col legno, half and whole tone trills, Repetition Performances (legato & spiccato), fast repetitions (150, 170, 190 bpm), artificial harmonics (staccato & sustained), ponticello (staccato, sustained, tremolo), a prior installation Vol. 1 is recommended but not obligatory, Sample Player "Vienna Instrument" included, intelligent detection of your performance, eLicenser (VSL, Steinberg, Syncrosoft) required for product activation (not included), content: software license plus Media-Pack (DVDs including all installation files), Windows 7 or higher, Mac OSX 10.7 or higher, Formats: Stand-Alone, AU/VST/AAX Native/RTAS (requires Pro Tools 7.3 or higher)