Anyway here's the pinout to get a Sony Walkman to enable USB out for external DAC, and some shots of the FiiO clone board I took the pinout off: 1 Ground 2 NC 3 USB D+ 4 USB D- 5 Ground 6 100k resistor to Ground 7 NC 8 Bridge to pin 10 9 NC 10 Bridge to pin 8 11 NC 12 NC (this is where VBAT would come out in theory if the pin was present) 13 NC 14 NC 15 NC 16 NC 17 NC 18 NC 19 NC 20 NC 21 Connected to (and labeled) USB 5v but it's actually the "digital audio out" pin that sits around 1.8v. I assume the official Sony adapter regulates VBAT to 5v in the plug or something. 22 Ground Pinned from "looking in to the back of the connector facing up".