range from two channels in and out, to over 30.

History

Standalone audio interfaces grew from the proprietary hard disk recording market of the 1980s and 1990s, but advances in processor power and hard drive speed meant that, by the mid-1990s, standard home computers were capable of recording multi-channel audio at 16-bit, 44khz compact disc standard.

Early systems such as Digidesign's Sound Tools (1989)

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