A crossfader is a device used in DJ mixers to fade audio signals between two channels. However, the device has several synonyms that can be used interchangeably. Some of the synonyms for the word crossfader include fader, mixer, slider, switch, transition knob, and blade. All of these words refer to the same device and are commonly used in the music industry. When choosing a term to describe this device, the context of the situation will typically determine which word is best used. Regardless of which word is chosen, they all serve to describe a device that is crucial for DJs to create a seamless blend of music.