Check the listing for details. Radial Engineering Tonebone PZ Pre 2-Channel Instrument Preamp Pedal. Condition: New. Listed at 409.99 USD. Radial Engineering Tonebone PZ Pre 2-Channel Instrument Preamp Pedal The Radial Engineering Tonebone PZ-Pre deals out incredibly natural-sounding acoustic preamplificiation. This pedal can be used with a variety of acoustic instruments, from guitars to basses to violins. The PZ Pre is versatile as well, with two inputs for easy live instrument switching. Add in Radial's excellent 100% discrete Class-A Piezo Boosters and you get heaps of power with less noise. Fully-featured I/O is another strength of the PZ-Pre. With 1/4" and XLR inputs, you can use the PZ-Pre on stage, at home, or while recording. Versatility, quiet operation, and easy functionality make the PZ-Pre the ultimate in acoustic preamp pedals. Features: -Two channels to switch between instruments -Notch & resonance filters eliminate feedback -Pre & Post Radial DI outputs for PA and monitors -Power booster and mute for more control on stage