Here's a link
http://www.singxer.com/pd.jsp?id=19 Good luck. I know they paid for this driver, the Halo is 4.11 this is 4.36 so a newer version of the driver. As mentioned I think the noise we hear comes from the dac and the 9018 chips, I no longer own a gustard, so i can't play around and try new things. I got addicted to 512 and when my USB/I2S card failed there, at the time, was no other way to get 512 so I found a good deal on a T+A Dac8DSD and that is my dac. I'd ask on the X20 pro thread if they get any white noise when the X20pro starts to play. In my experience after modding the SU-1 I brought it over to a friends in Knoxville who has the x20 and we connected it and had 10-15 seconds of white noise and then nothing but music after that.