Recording interfaces are at the center of any digital recording setup: the brain that converts analog signal from an instrument or microphone into a digital signal that can be processed by a computer or standalone DAW. Entry level interfaces like the popular Apogee Duet or Scarlett series from Focusrite include onboard preamps, which simply require an input source like a microphone and a cable to get up and running. For more advance setups, studios will deploy standalone pres and opt for higher end A/D convertors that rather than the all-in-one interfaces seen at the consumer level. No matter what your exact needs, you can find interfaces to cover all your input and output needs on Reverb.