Thank you guys.
I´ve stolen the synth sound idea from Steve Stevens who also played the synth sounds in the bridge of Rebel Yell ("I walked the ward with you, babe A thousand miles with you...") just with a guitar, not with a synth. Key is NOT to use an Amp or Cab, so switch it off. The distortion comes from a
Muffin (drive: 3.8, Tone 4.7, Mix 100%) in the Stomp section. In he X slot is
Hyper Chorus (Depth 5.7, Amount 3.0, Mix 100%), which is followed by a
Chromatic Pitcher (Voice 1 -12, Voice 2 +12, Balance - 30%, Mix -30%) in the MOD slot. You can add a
Chromatic Pitch in slot B to pitch the sound 1 octave up. I ticked the box "Smooth Chords". You get some digital glitches, which I find great for a more synth like sound.
As usual: some delay and reverb helps also...