I am ecstatic that you thought of this and brought it out for us to use. Thank you. I like to play Carnatic music, and now I do not need to carry a Tamboura, or even a srutibox. I predict the convenience will engender more music. My suggestion is to go beyond a srutibox and add the sounds of a Tamboura as well: i.e. to be able to sound notes individually in time as strings. Then we could even use this in concert situations!
layaman about SrutiBox