Martin thanks , our posts crossed: It works !! Now i have melody and bass on one sheet and the bass does not change anymore!
The new thing now is that the bass line is written very low on about 6 extra lines for the notes which looks very confusing and takes a lot of space. Can i 'lift ' this bass line without doing any harm to the musical side of the song ? (I'm a drummer and have not a clue about tones , only a bit about rithms

Bart