Question How can I clear/delete the user preset from the G-Major

If you just want to clear one preset, just overwrite it with another preset. If you want to clear all presets at the same time, hold the TAP key while powering up. This will take you to a special menu. With the dial, scroll to "Clear all presets", and press TAP. After a few seconds, the display will show "Clear/reset done". After that, just power off and on again as normal.