Their drivers usually follow the Audio Stream Input Output protocol for use with professional sound engineering and music software, although ASIO drivers are also available for a range of consumer-grade sound cards. Professional sound cards are usually described as "audio interfaces", and sometimes have the form of external rack-mountable units using USBFireWireor an optical interface, to offer sufficient data rates. The emphasis in these products is, in general, on multiple input and output connectors, direct hardware support for multiple input[…]
