Dave and Mgomes are correct.. Ther are a total of 128 effect memories . The first 100 are the writable locations and the last[101-128] are writable spots. From the factory the first 28 are the factory presets[same as the presets 101-128, but you can write overthem. The remaining group 29-100 are variation and custom effects shipped from the factory.. The procedure for factory reset was correctly stated,,Fran