Has anyone tried the ToneWood with other acoustic string instruments, e.g., upright bass, cello, violin?
Unfortunately, TWA will not work with instruments with f-holes rather than a traditional acoustic guitar soundhole. The limitation is the size of the X-Brace mounted internally. This brace measures 3x3x1.25" and will not fit through an f-hole. I suppose one could temporarily affix their TWA using blue painters tape or an alternative mounting method, but we've not seen it done.