Where can I get the manual for the Rumble LT amplifier? You can view and download the manual right here! Related articles Where can I get a copy of the Rumble LT Quick Start Guide? How do I update the firmware on my Mustang LT or Rumble LT? Where can I get the manual for the Mustang LT amplifier? How to update the firmware on a Mustang GTX, GT or Rumble amplifier How do I download Fender Tone® for Mac or Windows?