Hi again!
i reworked almost everything and uploaded the track on my soundcloud accout:
https://soundcloud.com/audiojunglealchemystudio/carefree-and-happy-shamisen
i need some kind comments about its usability… is the mix ok?
i think the overall sound and idea is cool. maybe not too original but at least the sound has something “different” from all the standard ukulele tracks! 
thanks for any help! 