Barhook, I see where it becomes confusing. A 16th note, the note itself, dictates only duration it is played in a particular time signature. Your right the 16th note is four clicks inside 1 click on the metronome only in 4/4 time. In 8/8 it's only 2, and 16/16 it's only 1. The value of the note changes. This is because the bottom note of time signature tells you what note gets one beat. Like 4/4 it's the quarter note, 4= quarter, 8= eighth, 16= sixteenth, 2= half, 1= whole. It all goes by feel, you can notice this if you have a metronome and you play around with. I will explain it alot further, once I start writing up tricks so I can record an audio and you can hear the difference.