2 Built-in Effects

In the 1950’s, Fender and Vox introduce amplifiers that include built-in effects: tremolo and reverb. These effects were featured on countless recordings and are still industry standard effects to this day. The Fender Bassman, Fender Deluxe Reverb, Fender Twin Reverb, Fender Princeton, Vox AC30, and Vox AC15 ushered in effects that will likely always be a part of popular music, changing the way musicians and listeners understood existing genres. (The Pedal Movie)