This will allow you to hear what it is that you are recording into MPC Essentials. After selecting your Input Source, turn on the Input Monitor.Resample allows you to record playback from MPC Essentials and re-sample your own arrangement or performance.External should be selected if you are using an audio source connected to your computer's audio input or a connected audio interface.You will need to select between External or Resample. Within MPC Essentials, click the Sample Record tab in the Mode Tab Section.Note: MPK and MPD MIDI controllers do not have audio inputs and do not function as an audio interface.