Rolls Mini-Mix VI MX28 is a three-channel stereo mixer designed for mixing keyboards, stereo guitar effects, and other stereo line-level signals. It features individual level and balance controls for each channel, as well as a master level control and headphone level control. The MX28 also has two stereo phone outputs: a 1/4-inch output and a 1/8-inch (3.5mm) output. With its compact size and versatile features, the MX28 is an ideal choice for musicians, DJs, and other audio professionals who need a portable and easy-to-use mixer.