Ears – This is THE most important tool in your quest. Some guitar players have a “sound” that is in their head they go about trying to materialize. Others have a desire to mimic their favorite recorded sound. Either way, you need to be adept at critically listening to what kind of sound is coming from your axe and discerning what needs to be done to achieve your goal, i.e. more bass, less gain, etc. On a side note, if you’re trying to mimic a recorded tone remember things aren’t always as they appear. You may have a blueprint of your favorite players rig with all of his settings clearly marked, but that is not necessarily what was used to record an album. In the recording process it is VERY common for several guitar tracks to be layered together to achieve the end result. It’s also very common for several different setups to be blended together. For example, you might use a Marshall cranked to 10 with a 15 watt practice amp mixed in to add “texture” to the sound. Remember just because your idol is standing next to a full stack in a Krank ad doesn’t mean he uses that exclusively.