I made a first sketch on a demo version of FL Studio.
Wich I later on had to copy by hand. Piece by piece. A long process later I had copied the song and worked the sound to a better quality.
I finally though that the melodi should be on guitar, so I grabbed my guitar and came up with a melody. But when I tried to get the sound from the guitar to sound good with the rest of the song, I failed. Big time. So I listen to the guitar samples and note by note made the melody as another synth that sound a bit like a trumpet.