MICROPHONE PREVIEW 4-channel preamp. Four Transformer-Based ISA Preamps: Over the last two decades, the ISA series mic preamps have been the choice of the world's top producers. Optional 8-Channel A/D Converter: Four A/D converter inputs provide eight channels of high-quality conversion, with 122 dB dynamic range and less than 250 picosecond jitter. Selectable Impedance: Ideal for matching the system to the impedance of different mics or for experimenting with creative applications. Impedance settings include the original 'Vintage ISA110' setting, which produces the famous 'Focusrite sound'. Four front-panel instrument inputs: Instantly accessible from the front panel, without the need for DI boxes. Dedicated analog insert points: All channels have switchable insert points, thus allowing routing (between preamp and output) via external processors. Precision LED meters on each channel: clear metering, designed to capture even the quickest and most elusive transients.