Modulation Pedals
There are four basic modulation effects that these pedals can give your electric guitar.
These modulations are: phase shift, chorus, tremolo, and flange.
Use a modulation pedal anytime you want to add depth and motion to your sound.
You will find modulation pedals from brands such as Electro-Harmonix, Red Witch, Wampler, Matthews Effects, Keeley, and MXR.