I now have a working script which turns on the USB port of my pCP when
the player is on and turns it off when the player is off. i have found
that my DAC produces an audible pop when it comes out of standby when
the pCP USB is on, but not if the USB port is turned on just after the
DAC comes out of standby. 
I want to modify the script so that 
1. When the pCP turns on the USB port turns on for a short time (TBD but
around 200ms). This time has to be long enough to wake up the DAC.
2. Turn off the USB port for a time (200ms?)
3. Turn on the USB port.
Does anyone know how to do this? The script is attached.


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