DSP stands for digital signal processing. It’s really a whole field of study unto itself, but in the most simple of terms it’s modifying a sound through digital means. For us this, will mean using guitar style effects to alter the sound.
Let’s start with a melody.
Now let’s add some distortion (fuzz to be specific).
Next, we filter some of the harshness out of the sound.
Then, we add some modulation effects.
Finally, we’ll add some delay and reverb.
This is a very extreme example of how a simple sound can be transformed into something completely new through DSP.