Weirdocoustic I (Acoustic Guitar Tone)

This $5 piezo-sensor from Aliexpress attached on $40 Koss Porta-Pro earphones placed on $10 IKEA pillow. This is the first attempt to create tone of piezo guitar. I assume the result could be much better if one takes the body of real acoustic guitar (it could be broken, neck is not needed), attach/glue a good medium-size speaker to the body, and take sound from the sound-hole with a microphone. Probably I will try to find some cheap guitar of flea market. The output level is low, even after I normalized the recorded audio traсk. So please raise the output level up to +12dB.