Aug 20, 2021 Fender FUSE 2.4. Fender FUSE 2.3. See all. With this tool you can customize your Fender® FUSE™-compatible amp and connect with a worldwide community of musicians. Fender Fuse app can cover a range of styles and sounds, which can be customized further if you wish. It has a simple interface, with gain, volume, treble, bass, and master volume.