

STUDIO finds inspiration from the time-honored “Pultec Trick,” a studio technique that adds clarity by cutting the “mud frequencies” and adding mid-range articulation. LOW-CUT reduces “tubby” bottom-end for a tighter sound with added headroom. JFET offers a completely transparent signal boost with zero coloring or distortion. High fidelity, noise-free Burr-Brown op amps help give ZIO extreme clarity and responsive pick dynamics, while maintaining ideal body and warmth. The pedal is designed to take a guitar’s high impedance signal, sweeten the tone with any of its four preamp circuits, and output a strong, low impedance signal that won’t be altered by the buffered dry tones of effect pedals further down the signal chain. The word "ZIO" is an acronym for Impedance (“Z” is the electrical symbol for impedance), Input (“I”), and Output (“O”).

You can also use the ZIO in your amp's effects loop if you want to drive your power amp even harder, or to compensate for a level mismatch between two channels. Use it at the front of your chain of effects to shape the rest of your outgoing tone, after your drive pedals as an overall tone sweetener or clean volume boost, or at the the end of your pedalboard to drive a long cable run or as a restorative device to recreate the sound of your guitar going directly into the input of your amplifier. ZIO is a deceptively flexible unit that can serve many different purposes at various places in your signal path. ZIO is Source Audio’s first all-analog effects pedal and designed in collaboration with Christopher Venter, the owner and sole engineer at SHOE Pedals. The goal in creating the ZIO Analog Front End + Boost was simple yet ambitious: “Make Everything Sound Better!” ZIO is an all-analog preamp/boost pedal that includes a choice of four distinct preamp circuits, each with up to +20dB of additional output boost.

Test Gear Various guitars, Mooer LoFi Machine, Mojo Hand Fx El Guapo, Dunlop Cry Baby 535Q wah, Ibanez ES2 Echo Shifter, Catalinbread Topanga, Tsakalis Audioworks Tremmatic, Jaguar HC50, Goodsell Valpreaux 21 Sparkling treble crispness returned with the gain knob around 9 o’clock, and from there on up I could drive my amps to so many degrees of gritty or sizzling glory that I began wondering what box might make better use of the clone’s real estate. When I stuck the Magnifier at the end of a board with only eight pedals (including a tuner and one of the best Klon clones on the market), its 20 dB of clean boost-courtesy of a front-end by Butler Audio (of BK Butler Tube Driver fame)-rejuvenated my signal in ways that were, frankly, revelatory. In this age of Klon worship, high-end buffers like the Crazy Tube Circuits Magnifier can often be a smaller, simpler, more affordable means to many of the same ends-particularly if the Centaur’s main allure is its ability to massively boost your signal without changing its essential character. But they’re useful for far more than that-especially if you prefer tube amps dialed to the verge of breakup. Buffer/preamp pedals are typically deployed to reinvigorate a signal sapped of its treble vitality by lots of circuit capacitance (e.g., tons of pedals or long cables).
