How to Play the Electric Guitar
The role of effectors

Effectors process sound

To create sound with an electric guitar, first select a pickup, adjust the tone and volume knobs on the body, then "season" the sound using an amplifier or effector.
Effectors are devices that are connected between the electric guitar and amplifier in order to process sound from the outside. Effectors allow for many interesting sounds to be created, and it is not rare for guitarists to connect several. If too many effects are applied it can of course become difficult to figure out what the original sound was!

The order effectors are connected in changes the sound

Effectors can be connected one after another and used simultaneously to create a sound that combines several effects. Each effector processes the sound coming into it, so just changing the order they are connected in can change the sound that ultimately comes out of the amplifier.