The advance control unit has 4 small switches which activate different advance curves. You may ask us to add further  10 curves of your design (for which you will be alone responsible, also for what they do to your engine)
click graphs to enlarge them

Please note that you can not change setting during engine run, but only with engine at standstill.
all to off will activate the standard RD400E curve
on-off-off-off will activate curve 1
off-on-off-off will activate curve 2
on-on-off-off will activate curve 3
off-off-on-off will activate curve 4
on-off-on-off will activate curve 5