A patch is a collection of effects, tones, and settings stored into one location. In Guitar mode, the GR-55 has 270 Preset and 297 User patches. In Bass mode, there are 90 Preset and 297 User patches.

To select a patch, press one of the SOUND STYLE buttons—LEAD, RHYTHM, OTHER, or USER—and then turn the dial to select a patch in that category.