Audio interfaces are the gateway between the computer and the outside world. With audio interfaces such as our Zoom GCE-3, Zoom AMS-22, Zoom AMS-24 and Zoom AMS-44, microphones, instruments, keyboards, mixers and external equipment such as effects units, compressors, microphone preamps, equalisers and many more can be connected to a computer. Even though all computers today have an integrated sound card, audio interfaces, which are usually available as external desktop units or 19" rack units, offer considerable advantages, especially for musicians, content creators, podcasters and in the recording studio or for home recording. Audio interfaces have one or more inputs with microphone preamplifiers, as well as several outputs, and the integrated A/D and D/A converters convert the analogue audio signal with at least 24-bit depth at a sampling frequency of at least 96 kHz into a digital audio signal, which can then be further processed with appropriate software such as audio editing programs, sequencers or DAW programs. The connection to the computer is usually made via the USB interface.