A microscope as a tool by Conoptical
https://youtu.be/7N-nBy0SozA?si=Xg1_gFKVV0igrjFK
Unlike to the usual stories with either having the right channel blocked when photo port is active or getting 50/50 for all channels all the time losing the contrast and the brightness this option allows you to have 100% mode for both channels with no altering the quality and, when the port is activated you have 100% on the left channel and 50% on the right one and 50% to the port