It’s always best to be as prepared as possible when entering the studio. When it comes to recording guitars and basses, a great amp and a great guitar are ideal but half of the tone really comes from players technique. As in, the way your hands rest on the guitar, the way you hold the pick, and the way you fret and attack the strings all have great influence on your tone. When entering the studio, it is important to be well rehearsed and to have fresh strings on your guitar or bass. It is not unusual for some engineers to request that you change your strings after every hour of playing in the studio. Thicker gauge strings are ideal for lower tunings. When it comes to tuning guitars and bass, it is recommended that one person is responsible for tuning all the instruments with a 1 cent or better accuracy tuner. Check the tuning fretted (usually check around the 5th and then the 12th fret positions) to make sure the instrument is tuned to play in tune. Having open strings in tune doesn’t mean that the instrument will play in tune, especially with lower tunings. The open string usually has to be a bit flat to actually play in tune to compensate for the fretting and strike of the note (again, most often in lower tunings). Make sure to keep the tuner calibrated to 440Hz!