With Raveberry 0.7, WLED can be configured in the visualization options. Now no more wiring is required to make Raveberry light up LEDs to the beat of the music.
Raveberry uses the UDP real time interface of WLED to update the colors 30 times per second, allowing it to dynamically control the LEDs in sync with the music. While Raveberry's options are admittedly tiny in comparison to the WLED interface, the original interface is still available. After disabling the WLED in Raveberry's visualization settings, the program will revert back to the previous configuration.