How do I get help with an issue with the Rumble digital amp? Use the Submit a Request link at the top of this page to send a message to our Customer Support team. Related articles How do I update the firmware on a Mustang GT or Rumble digital amplifier? Where can I get the expanded manual for the Rumble digital amplifier? Can I use the Rumble digital amps without Fender Tone? What is the Rumble digital bass amplier? How do I record to my computer using my Fender Rumble digital amp?