Joyo JF-13 AC Tone Vintage VINTAGE Tube Amp Pedal, Analog Circuit, Bypass Effect. You can adjust the level with DRIVE and apply the effect with VOICE, allowing for adjustments from a clean sound to a fat, thick drive. Adjustment is possible with the three knobs: LOW, MID, and HIGH, creating a great sound directly from the amp, like that produced by a tube amplifier. With this AC Tone, you can create clean and crunch tones, and by adding distortion-based effects, you can develop a wide range of thick sounds. The true bypass structure and improved quality of switches, etc., result in a relatively low-noise design. • Recommended for creating British sounds like a VOX AC30. Adjust the level with DRIVE and apply edge with VOICE, creating a great sound directly from the amp, like that produced by a tube amplifier. With this AC Tone, you can create clean and crunch tones, and by adding distortion-based effects, you can develop a wide range of thick sounds.