Many of the games you listed do not use PCM. You even list for example FF1 which do not use DPCM and use noise only for sound effects. Your just listed random NES games. This doesn't make any sense.
Huh? I described the list like this, except it's not random. Which is obvious if you go through it. I just didn't have the time to sort out the non-pcm games.
I edited some of the list, go ahead and edit the rest if you think others will get confused.