It's interesting what he is doing. He recorded four chords, each on every channel and this for 10 minutes. The reason for that is to use the 4 track like an instrument, just what the header says. But why doing this? Well, you can get a very nice saturated sound by recording on tape. When you have clipping on digital level it's always bad, but on tape you can add some distortion/saturation and this is what he did. Guess it's more for audiophiles and for geeks and nerds, but a creative way