v1.2: changed COM port open/close logic to on-demand to make it snappier when switching inputs
Atmel S/PDIF Switch USB Tray Control
Windows system tray utility to control an Atmel based S/PDIF Switch created by Beni_Skate on Tindie:
https://www.tindie.com/products/beni_skate/automatic-spdif-opticalrca-audio-switch/