The EXHB9 is useful when you're playing blues and jazz and can't find a keyboardplayer for the band. I'm afraid it takes some time to sound like an organplayer and not a gitarist with a tool (oh I bended again...).
Acoustic playing is a good training for the hands. I compose and learn a lot of songs on my acoustics.
Try Dust in the Wind from Kansas, Stairway to Heaven, listen to the old band Heart, Melissa Etheridge and songs from Jason Mraz, Ed Sheeran, Gavin Degraw, James Morrison etc.