I bought a Dimarzio contact piezo pickup to see if it works with my guitars with no pickups, and run it to my Tonedexter.
Hey, they don't sound too bad! Just as good as any undersaddle, I suppose...but we need technology to improve the sound, and I have it! It will probably scream like a demon up loud...
So they say the (removable) putty that you stick the pickup to the guitar with won't mark the guitar. It does!
And then I tried the old Gibson L-0...and if it has a mark after, I can't tell for all the others.
Quick recording - made Tonedexter file with mic and pickup, then removed mic, so this is playing through the TD file, no mic:
https://soundcloud.com/bk7-3/l-0-td77
Photos:
BluesKing777.