My changelog:
As I write this, I realize how simple the other documentation is compared to the music page. It's not a problem, it's just...interesting.
Going off of how rulz explained these effects, I added this distinction to describe the sole rule that Channel 3 has about its effect limits. Previously we thought that Channel 3 was incapable of any effects other than 0xy, E8x, ECx and Cxx. The previous documentation even forgot to include that Channel 3 can use effect Cxx.