I forgotten to write that I've changed the bridge. I've made a bridge where the string are going thru the bridge and the top. That is a stronger construction and it sounds better.
I've got the idea from the RISA soprano that I own. You can see it on this vid after 4 min 20 sec https://www.youtube.com/watch?v=mU42wHlS-NY&feature=player_embed...
It has a mellow round sound. I use it for gigs using a microphone and for acoustic gigs. You can watch and hear me playing on: http://www.hulaboxes.de/
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I've got the idea from the RISA soprano that I own. You can see it on this vid after 4 min 20 sec
https://www.youtube.com/watch?v=mU42wHlS-NY&feature=player_embed...