How do I get help with an issue with the Mustang GT 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 to update the firmware on a Mustang GTX, GT or Rumble amplifier* Mustang GTX Firmware Version Release Notes* Can I use the Mustang GT amp without Fender Tone?* How do I update the firmware on my Mustang LT or Rumble LT?* How to reduce USB audio latency by using an ASIO™ driver with a Windows-based computer*