The input stage uses a Centaur buffer topology expanded with a dual parallel op-amp design, as outlined in Douglas Self's Small Signal Audio Design. Splitting the input signal across two parallel op-amp paths reduces internal voltage noise by 3 dB per op-amp.
10 dB Boost: A sweet spot to add life and presence to the audio signal. 17 dB Boost: Additional output to push a clean tube amplifier slightly past the edge of breakup. Great for lead work, solos, or driving saturated gain stages further.
Using the second switch, the entire amplifier stage can be completely bypassed. In this mode, the device functions solely as a pure buffer based on the Centaur schematic improved by the Douglas Self concept.