The shelving sections are a mathematically exact emulation of a classic (1950s) Baxandall tone-control circuit, but with modern twists. The turnover frequencies are continuously variable, allowing fine-tuning of proximity-effect reduction at the low-frequency end, and choice of ‘air’ EQ (extreme high frequencies) or far more aggressive ‘presence’ EQ (high mids) — or anything in between. This is a highly versatile combination. Two fully parametric sections permit more surgical sonic control; although operationally identical to others, these circuits are more complex than standard ‘cookbook’ parametric sections, with the intention of offering EQ that does what one would expect equalization to do, rather than baldly perform as normal. The key to the equalizer overall is that through carefully chosen defaults, ‘shapes’, and sonic characteristics, things just fall to hand nicely to accomplish what the operator wants with minimum effort, rather than making him fight for it.