Source Audio SA 271 - ZIO Analog Front End + Boost, preamp / boost effects pedal, 4 selectable preamp circuits (JFET / LOW-CUT / STUDIO / E-PLEX), JFET for transparent, flat frequency curve, LOW-CUT cuts lows without affecting mid to high frequencies, STUDIO replicates 'Pultec Trick' equalization, E-PLEX was inspired by the preamp in a vintage tape delay unit, output control with up to +20dB of signal boost, high quality components and Burr Brown JFET op-amps, 3-way Tone toggle switch with cable capacitance voicing (Bright / Medium / Dark), 2-way Footswitch Action toggle switch (with always-on Mute option), true bypass, control for Output, Circuit rotary switch, Tone toggle switch, Footswitch Action toggle switch, bypass footswitch, status LED, brushed anodized aluminum housing, 6.3 mm mono in / output jacks, 6.3 mm mono tuner / line output jack, power supply via optional 9V DC adapter, 2.1 x 5.5 mm barrel plug, polarity (-) center, battery operation not supported, current draw 25 mA, dimensions (L x W x H) 105 x 60 x 56 mm / 4.1"" x 2.36"" x 2.22""