The Green Pony (OD-820) doesn't need the "minimum gain" mod because it doesn't have a minimum gain limiting resistor. The gain goes all the way to zero as it is. Furthermore, the OD-820 has a dry blend. It's part of the gain knob. It's a dual gang pot. As you turn down the gain, you turn increase the dry signal.
So while you can't modify the minimum gain, you can increase or decrease the maximum gain. The R8/2k2 resistor controls this. Increasing the value will decrease maximum gain. Reducing the value will increase maximum gain.
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