My schematic/code are from here : http://www.imdb.com/title/tt0052520/ !!!
I did it work ... by re-reversing all those commands :
" If VALA > 650 and VALA < 940 Then Gosub LED1"" ...
instead of :
" If VALA < 940 and VALA > 650 Then Gosub LED1"

Nothing else ! And now everything works just fine !
Thank you all for support !
Have a Nice and Happy Easter !