So the input jack says optical/line but in the settings the input options are line or digital, is the digital the optical input? And if so, wouldn't you need a special optical cable that doesn't fit the 1/8th" input the iRiver has? I don't get it.
Also, my other question (which is probably the same as the one above) is what's the difference between setting the input to line as opposed to digital, especially when the input jack says OPTICAL/LINE. I've always just set it to line-in except when I patched out of a D50 recently I had to switch it to digital to get the feed.