The shape of a guitar sound wave can vary depending on the instrument, the way it is played, and the recording environment. However, some general features are typically present. The waveform usually starts with a sharp attack, followed by a decay that can be more or less rapid. The sustain portion of the waveform is where the note is held at a constant amplitude, and the release is the decay of the sound after the note is stopped.
The amplitude of the waveform determines the loudness of the sound, and the duration of the waveform determines how long the note is heard. The frequency of the waveform determines the pitch of the note, and the shape of the waveform determines the timbre of the sound.
Here is a simplified diagram of a guitar sound wave:
```
|
| _
| / \
____|__/ \_____________________________
```
The x-axis represents time, and the y-axis represents amplitude. The attack is the sharp rise at the beginning of the waveform, the decay is the downward slope that follows the attack, the sustain is the flat section in the middle of the waveform, and the release is the downward slope at the end of the waveform.
The sound of a guitar is a complex and beautiful thing, and the sound wave is a fascinating way to visualize the physics of music.