I thought this guitar could be of interest, plainly put it houses any two buffers. Its powered by one 9 volt with normal consumption. It allows comparison of any two buffers with real time back and forth switching.
Additionally Greg Bailey makes Travis bean replacement parts and more, anything metal, the guy has vision, I felt this instrument was a great vehicle for this purpose.
This guitar holds two buffers powered by one battery. They can be switched on the fly while playing. I use this for Demonstration purposes
Any 2 buffers can be installed in minutes
There is also a lobat battery monitor installed
It has two SD2 pickups wired like rosebud so the middle position forms a humbucker when both pickups are in tapped mode. there is also a reverse phase switch, and the OBEL, one volume & two tones