I played a used GT-100 last week, and I experienced some encoder sensitivity issues, especially on the page where you select the type of effect. Sometimes it would over shoot the selection and times it wouldn't move as fast as I wanted. I know this is a version 1.x unit, because of the lack of the new version 2 effects. Unfortunately, I could not check the exact firmware version, because at the time I didn't know the button combination to press when starting up the unit. Is this a known issue for an early version of the firmware, or should I steer clear of this unit?