Enclosed is a screenshot of another 816 (csx in this case) and in normal operation with the gain down there is nothing to see in Stereo in 3 but with the gain completely open you can see again some hum. By the way there is no cable connected to Stereo in 3. In all the other channel inputs are cables connected but the gain is completely turned to the left.
So I don’t know if you can make a conclusion from this that alle the MR816 have the same problem or mabye this is normal not only with the MR816 but also with other soundcards.
More results are welcome also from other soundcards because I am qurious what happens to them when you turn the gain completely up.
