For sale due to equipment refresh. Power-on and sound output have been confirmed. App connection also works normally, and there was no crackling or noise. It's helpful that it can output sound close to the acoustic sound even with a piezo pickup! Thank you for your consideration. Impulse response pedal for acoustic guitars, equipped with volume and anti-feedback functions. - Model: VOICEPRINT D.I. - Function: Impulse response pedal for acoustic guitars - Controls: Volume, Voice, Select, Anti-Feedback, Pad - Switches: Mute, Next - Package: With original box Thank you for viewing.