With a piezo preamp, you can plug your piezo Cigar Box Guitar into almost any guitar effects pedal and get good results. I'm especially pleased with how my guitar and preamp sound through the Zoom G1X Four, but I wanted to see how it performed through my TC Helicon Play Electric, which has guitar effects but is the best vocal harmonizer I've ever encountered. Watch this video for the results of this experiment:
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Sounds great and looks bea too. Will you be selling them