This is a high-quality stabilizer and buffer from Eva Electronics. I've tried various buffer pedals before, but this one has a noticeable effect. It adds punch to the sound and improves clarity significantly. It's perfect for modern music. This model features a phase switch and impedance selection switches for high-impedance inputs (passive instruments) and low-impedance inputs (active instruments). Because you can select the impedance, it can be used with most instruments. Suitable for guitar and bass. By controlling the phase and impedance, you can achieve perfect sound quality. It revives the sound of passive instruments. Especially recommended for bassists who use both active and passive instruments.