In the GT-100, a patch is a group of effect combinations and their settings stored in one location. Patches are stored in groups of four, each of which is a "bank." There are 200 permanent factory Preset patches. Preset patch names begin with a "P," while User patches begin with "U."
Tip: From the factory, User banks contain the same patches as the Preset banks, so feel free to replace the User patches with your own...you won't lose anything. 

To select a patch you can; 
1. Turn knob 1 to scroll through all of the GT-100's patches.
2. Use the BANK UP and BANK DOWN foot pedals to select the desired bank and then pedals 1,2,3,or 4 to choose the patch you want in the selected bank.