ADDSTRING MODULAR SYSTEM - Back in 2007 Roger McGuinn teamed-up with C.F. Martin & Co. for a signature model 7-string guitar; the 7th string being an octave G string. This allowed McGuinn to have in one guitar an instrument that allowed him to capture a very significant essence of the twelve-string guitar while maintaining the clean bass runs and the high-end clarity of a six-string guitar. All-in-all a fine instrument. Now Addventor, a Netherlands based company, has developed an effective, fully patented system for easily converting most 6-string acoustic guitars to a 7-string. And the only permanent physical alteration to your guitar is the additional string slot cut into the nut. This is a well designed modular system, with very clear installation instructions (you can watch the installation video here on our web site). They have even included a soundhole mounted muting device so that so can silence the 7th string and easily go back to the six-string sound. Nicely done. We have one
