Rumble Stage and Studio Support Click here or go to https://www.fender.com/tone/support to visit the Rumble Stage and Studio support home. Related articles Effective March 20, 2020 Fender® FUSE™ has been discontinued. Fender® Bass Amplifier Owner's Manuals (Current) How do I update the Firmware on the Mustang LT amplifier? How do I update the Firmware on the Rumble LT amplifier? Mustang GT Support