The term 'STEREO CONTROL' refers to the various components used to control the sound of a stereo system. The three solutions for this term are BASS (4 letters), FADER (5 letters), and VOLUMEDIAL (10 letters). BASS is a type of equalizer that adjusts the low-frequency sounds in a stereo system. FADER is a device used to adjust the volume of a stereo system. VOLUMEDIAL is a knob used to adjust the overall volume of a stereo system.