Okay, there's this friend I have . He asked me to customize a Boss SD-1 for him to whatever specs I thought would be best.
Here's the rest:
I did a couple of top secret modifications to the stock circuit to make it sound almost exactly like a pedal of my own in development "Angel Crank"
I gave the SD-1 more clarity, a more stable bass response, a more open sound, and more output in general (overdrive/clipping and volume-wise); overall just a better Overdrive.