The PH-10, like MXR's M-101 Phase 90 (the natural comparison in this price range), did not sound that great out of the box. I took it apart to see if there was an easily accessible trimpot inside, and there was indeed.
The stock sound was over-pronounced for me. I made careful note of the stock position of the trimpot screw and turned it little by little until it sounded good to me. You may end up with different results if you try this, but I ended up about 270 degrees counter-clockwise from the original position (see pic below). The pedal now sounds much creamier. If I don't sell it first, I will a/b it with an Custom Shop Phase 90 and a 74 Script Phase 90. One thing at a time, though.
The yellow dot indicates the stock (top) and adjusted (bottom) position of that end of the slot.