On my old [and long gone] Amiga with 'Deluxe Paint 5' I could have done that in a snap...we seem to be going backwards...LOL...sounds like that's the technique you'll have to use Gwyn...sigh, I as well was hoping for multi colour brushes....Maybe Corel Painter can do that...have you looked into that app?

 

Once in a while I look around,
I see a sound
and try to write it down
Sometimes they come out very soft
Tinkling light sound
The Sun comes up again