This is an interesting Canadian-made effector that attaches directly to an acoustic-electric guitar body to add effects to the natural sound. Like Yamaha's TransAcoustic guitar, this effector attaches to the back of an acoustic guitar and adds reverb, chorus, etc., to the acoustic guitar's natural sound. You attach this device using the included super-strong magnets, sandwiching it from inside the body. You then input the output from the acoustic-electric guitar into this device. It also works with aftermarket pickups. The effector attached to the body directly vibrates the body with the effected sound. Eight types of effects are available (see photo). There are some gimmicky effects like auto-wah, but several orthodox reverbs and choruses sound great. Operation has been confirmed. It runs on three AA batteries. Search for "Tonewood amp" on YouTube, etc., to find detailed installation instructions. Example) Here is a video of a Japanese person using reverb: https://youtu.be/Qg1DsrV7mSE?si=6fo56DULqdIsooLl Type: Acoustic guitar attachment effector