Sashimi
I am using USB tube amp….and there is 3.5 jack on it too
It may be possible to plug a 3.5 mm input (from your phone, for example) into the amp and hear on the computer over USB. It depends on the design of your amplifier. Some amps mix the 3.5 mm line in with the speaker only, so you don't hear the backing track over USB. Other amps mix it with the guitar signal so you can hear it over USB.
You need to try it out to see if it works or check the user manual for your amplifier.
Please keep in mind that all music played into jammr must be
Creative Commons Attribution Share-Alike 3.0 licensed. Do not upload music that you have no permission to share.