Boost (Preamp / Boost) · $199
The Source Audio ZIO Analog Front End + Boost is an analog preamp / Boost pedal based on the All-analog preamp/boost (JFET / Low-Cut / Studio / E-Plex), with Circuit knob (4 preamp modes), Output knob; 3-way Tone toggle (Bright/Med/Dark); footswitch-action toggle controls, made in USA. From $199.
| Category | Boost (Preamp / Boost) |
| Circuit / based on | All-analog preamp/boost (JFET / Low-Cut / Studio / E-Plex) |
| Signal | Analog |
| Controls | Circuit knob (4 preamp modes), Output knob; 3-way Tone toggle (Bright/Med/Dark); footswitch-action toggle |
| Switches | 3-way Tone toggle; 2-way footswitch-action toggle |
| Footswitches | 1 |
| Bypass | True bypass |
| True bypass | Yes |
| I/O | 1/4 in (1 MΩ) / 1/4 out (150 Ω) |
| Power | 9V DC center-negative |
| Power draw | 20 mA |
| Enclosure | Brushed anodized aluminum |
| Dimensions | 4.1 x 2.36 x 2.22 in |
| Country of manufacture | USA |
Closest matches from other makers, by spec and circuit.