Where can I get a copy of the Mustang GT v2.0 Manual Addendum? You can view and download the v2.0 Manual Addendum right here! Related articles Where can I get the expanded manual for the Mustang GT amplifier? Are there foreign-language translations of the Mustang GT Expanded Owner’s Manual? Mustang GT Firmware Version Release Notes How to update the firmware on a Mustang GTX, GT or Rumble amplifier Where can I get a copy of the Rumble Stage/Studio v2.0 Manual Addendum?