This document provides instructions for recording an electric guitar or bass using an amplifier. It outlines four main ways to do this: 1) Using a microphone to record the amplified sound of the guitar through the amp and cabinet. 2) Using a direct input box to directly record the amplified guitar signal. 3) Using an audio interface to directly record the guitar signal. 4) Using an audio interface and microphone to record both a direct guitar signal and the amplified sound of the guitar through the amp and cabinet. The document discusses the pros and cons of each method.