hi
i got a new ion XE a couple of months ago - if you read through the manual it says that it only has two modes on uk models (noted by the green on-off power button). the two modes are semi and and rebound - consult your manual on page 11.
Would advise setting your marker for semi which is the lowest setting on there, you will also be able to adjust your Rate Of Fire and Dwell which is explained on page 9-11 in your manual. If you don't have a manual, go to the smart parts website as they have all there current manuals on there.
twiddle your index and middle fingers
thing shoots pritty damm fast when you get it going, and its bloody satisfying when it goes