Explore the Twin Reverb Tone Master (TRTM) Dec 7, 2021 13:10:27 GMT -5 HomeQuote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by mickkotter on Dec 7, 2021 13:10:27 GMT -5 can anyone share how to determine what firmware is installed on the TRTM?there/s a usb out on the chassis to permit mounting a image onto a computer.