From Analogman:
The MT2/pro mod takes the fakeness away, that cocked-wah super-saturated, big hair, harsh and noisy distortion. It leaves plenty of distortion available, but you can hear the guitar's actual sound after the mod. On the stock pedal, if you sweep the mid range frequency knob it sounds like you are sweeping white noise. After the mod, it sounds like you are sweeping a parametric EQ or wah pedal. The mod is very expensive to do and includes two of our rare KOT clipping diodes, and a chip change on pedals made before 2008. As on the DS1, Boss copied some parts of our mods, and are using the JRC chip we specified on their newer pedals. The mod also includes most of our silver mod parts from the tube screamer, many upgraded capacitors.

In addition to improving the note, the mod also reduces noise by 5dB with all knobs at 12:00.

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