The ART USBMIX4 is a 4-channel mixer and computer interface. It allows you to connect microphones, instruments, and preferable line inputs easily. You can also easily connect to a computer using the USB port. There are also independent controls for all the inputs, main output, and headphone output. The controls have been designed in such a way that the mixer is as compact as possible so that it won't take up much space in your studio, backpack, or desk.