An analog mixer is a tool for recording and live sound that enhances and combines signals from microphones or instruments. To ensure that each input is heard clearly in the mix, most analogue mixers include onboard mixing capabilities such as EQ, panning, and effects. Individual mixer tracks are blended down to a single stereo output at the end of the signal flow, which is then transferred to a recording device, PA system amplifier, or headphone output. Many mixers have signal routing options such as aux sends, groups, and inserts in addition to the main outputs. Analog mixers come in numerous shapes and sizes, but the small and medium sized desktop machines used in live sound and home recording are the most prevalent.