I received request for backing from IzzyCom, so here it is

Click to view attachment

Have fun with improvising and would like to hear the result

well thx dejan although for me its quite hard improvising when i know the actual notes you are playing

its in A minor man

<or did i mis-read your post?

yes, it is in A minor

And how to improvise? that is kind of individual, play something similar to the tune and you will come up with your own