Blade uses a diode bridge recitifer in the feedback loop of an inverting opamp to create crossover-like distortion. There are five controls. Drive adjusts how much signal is fed into the loop, Depth controls how strong the effect is, Sym (Pos) and Sym (Neg) affects the symentry of the signal by setting the level on the positive and negative sweeps of the signal, and a Level output control.
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You can see what Blade and it's controls do in these scope shots:
Clean input signal
Blade engaged with depth at full
Blade with depth at half
Blade with depth at zero
Blade with Sym (Pos) at half
Blade with Sym (Pos) at zero
Blade with Sym (Neg) at zero
Blade with Drive at half
Blade with Drive at near zero
Your Tone God,
Andrew
thetonegod@yahoo.com