No specific info about version 4.2. Please visit the main page of Guitar Rig on Mac Informer.
GarageBand allows you to mix and create your own music tracks and podcasts.
Play and edit tabulatures for 4- to 8- string instruments easily.
MIDI Guitar allows you to convert your guitars analog signal into MIDI.
Brings world-class synth sounds to the modern guitarist.
Edits tablature files in Java and supports GuitarPro and PowerTab files as well.