This is an incredible tutorial. I been following it closely & asking lots of questions. But now at that end. I am stumped at the land noise portion. I can get the first part of noise done. But somehow, after I complete that process, I am no longer able to "replace selection with this channel" after I 15% blur. Not sure if I am in the channel, or layer. But I am pretty sure I am following the tutorial right. Anyone else have suggestions?