Found! - DAMN you guys are good!!

It's this one I remember:
   • Swinth (aka Light Fantastic) featurin...  
But I got the G# in the chorus wrong (it seemed logic when the start part is doing it), and the high part I play in the end, I have no idea where I got it from, it's not in the song :D
....but I made it 151 BPM it should have been 149,8 ...I must have a good internal beat, when I remember after 40 years :D

And I had NO idea it was a real song, I have never heard it before, it's SO f*cking cool this 12"
   • Saturdays In Silesia (Extended Version)  

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I think it's a C64 tune, I played it on my keyboard in the 80's, maybe it was something I composed, I really don't remember.
I tried recreating it as I remember it.

Please let me know in the comments if you know the title.

A little fun video, showing that fast 1½ octave change in 240 fps:    • 240 FPS Slow Motion of a fast key cha...