* Adjust the string tension. The higher the string tension, the higher the pitch. You can increase string tension by tightening the tuning pegs or by using thicker strings.
* Change the length of the strings. The shorter the strings, the higher the pitch. You can shorten the strings by moving the bridge closer to the sound hole.
* Use a different type of string. Different types of strings have different tensions and timbres. Experiment with different strings until you find the sound you like.
To change the loudness of a shoe box guitar, you can:
* Pluck the strings harder. The harder you pluck the strings, the louder the sound.
* Use a pick. A pick will produce a louder sound than your fingers.
* Place the guitar in a resonant environment. A resonant environment, such as a room with hard surfaces, will amplify the sound of the guitar.
* Use an amplifier. An amplifier can boost the volume of the guitar.