During his radio shows, Paul introduced the fictional "" device, which multiplies anything fed into it, such as a guitar sound or a voice. It was Paul's way of explaining how his single guitar could be multiplied to become a group of guitars. The device even became the subject of comedy, with Ford multiplying herself and her vacuum cleaner with it so she could finish the housework faster. Later, Paul created a real Les Paulverizer that he attached to his guitar. The invention allowed Paul to access pre-recorded layers of songs during live performances so he could replicate his recorded sound on stage.