OK my friend I think I understand - when using the music staff to notate drums, the position of a note on the staff is unrelated to the tuning of the drum that it signifies. I like the way you explain that, and also explanation of the variation for Latin music. Thanks, that is good information I didn't have before!
But going back to Roka's initial question about tuning for pop and funk, the concept I wanted to convey was that, based on my experience, by tuning the conga, tumba, bongos, etc. to important scalar tones that are found in the predominant keys that the band plays in, the open tones in the percussion patterns make a really nice melodic/harmonic contribution to the music being played, which is over and above the rhythmic contribution of the patterns, i.e., the open tones "sing" within the music, at least to my ear!
Actually, for bongos (when I carry them with me), my macho I tune without regard to pitch - I tune it up as high as I think I can get away with without splitting the skin - I like it tight! But the hembra I will tune so that it cooperates harmonically with my conga and tumba tunings. I use the melodic relationship found in the blues line "its cheaper to keep her" to establish the tuning relationship between those three drums.