If you are a musician playing the acoustic guitar you might find this demo very interesting. 
This recording demonstrates how the ToneWoodAmp can enhance the sound of your acoustic guitar without external amplifier/speaker. 
The ToneWooodAmp is a small gizmo that can be easily attached to the back of any acoustic guitar, allowing guitar players to add a "layers" of sound effects to the naturally occurring guitar sound using the guitar’s body itself, Instead of using an external amplifier/speaker. Learn more at www.tonewoodamp.com and www.facebook.com/tonewoodamp. 

Click Here 4 ToneWoodAmp Sound Demo (clean FX - Please use headphones)

The ToneWooodAmp is a small gizmo that can be easily attached to the back of virtually any acoustic guitar, allowing guitar players to add sound effects (such as reverb, delay, echo, tremolo etc.) to the naturally occurring guitar sound. But Instead of using external amp/speaker to produce these effects, the ToneWoodAmp is using the guitar’s body itself to produce these added sounds, doing so by vibrating the back side of the guitar, initially generating another “layer” of sound waves in addition to the natural sounds that the guitar strings create. 

Before the ToneWoodAmp, acoustic guitarist who wanted to experience the sound of their guitar with the benefits of added effects had to own, carry and connect their instrument to external amplifiers or sound board. There was no other way for guitarists to just grab his/her guitar and play a song with effects. This dependency on external equipment hindered the natural mobility of the acoustic guitar. 
Now, with the ToneWoodAmp, guitarists can carry just their guitar, and turn on these effects any time any place. This ability to add at will any effect to the guitar body itself with no dependency on additional and heavy equipment to carry, is liberating for all guitarists who wanted to play for fun, practice, write a song, travel and even perform.
