Ok I have the solution:
send this sysex: 1011 127 0

It works !

--- In kiwitechnics@yahoogroups.com , "poiskaill" <poiskaill@...> wrote:
>
> Thanks Florian,
>
> This works well, but needs to be done every time you power on the synth.
> Quite boring ;)
>
> Fred
>
> --- In kiwitechnics@yahoogroups.com , Florian Anwander <fanwander@> wrote:
> >
> > poiskaill wrote:
> > > Thanks Florian,
> > >
> > > I own an original one, but your omni off method doesn't work for me :(
> > Then try this:
> > http://fa.utfs.org/diy/jx3p/jx3p_howto.htm
> >
> > Florian
> >
>