A sound mixer is also known as a mixing console or more commonly an audio mixer. This is an electronic device used for mixing, balancing, and combining different sounds and audio signals, sources like microphones, instruments, and synthesizers, or previously recorded audio.The way a mixer works depends on the number of input and output channels it has. For instance, an 8×2 mixer means 8 inputs channels are being mixed into 2 output channels for a stereo recording while a 16×8 mixer means there are 16-in and 8-out options on the mixing console with 16 input channels and 8 output channels for recording a multi-track. With more input channels a mixer has more capacity for instruments and sound signals the mixer can combine and blend.