All of the played notes will be in dischord. As for the unplayed notes: each note is a harmonic series of pure tones (F, 2F, 3F, ... where F is the fundamental

All of the played notes will be in dischord. As for the unplayed notes: each note is a harmonic series of pure tones (F, 2F, 3F, ... where F is the fundamental frequency). Different notes have some degree of (sometimes approximate) overlap in their harmonic series (indeed, the greater the overlap, the more the notes sound to be in harmony). So, all of the tones in the un-notes' harmonic series will still be present as overtones of the other notes. Therefore, the un-notes would likely be a fairly subtle damping of a few frequencies.