Not sure if someone has a similar problem as I do. I am using a Windows 10 HTPC (always on) with FTP server installed (that’s why it’s always on) connecting to a Pro-ject Pre Box S2 Digital USB DAC via Audirvana, remotely controlled by Audirvana Remote app with my iPhone/iPad. The problem is my DAC does not come with a power button. Means as long as the USB port is powered up (my case), it will not shut down which makes me feel bad. Since I can’t put my PC into S3 sleep mode due to the FTP server, I do not have any solution but unplugging my DAC which is extremely stupid. Does anyone has a good suggestion? Even if I remove FTP server and put the PC in S3 mode, there is no way for my wife to use Audirvana app to wake up the PC and play music. Need some help here! Much appreciated!