"16 + 2" is likely the term used for a common jazz b3 tonewheel organ setting.

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Which is the 16' rank at full along with the 2' rank at full, ala Jimmy Smith's opening registration in his famous "Mack the Knife" rendition.

In this youtube, taken from a tv show back in the day, Jimmy is "kind of" using the 16+2 on the noodling, adding more of the upper harmonic drawbars to the mix to get that "chewing" kind of needly sound.

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https://www.youtube.com/watch?v=2yfkX8AIU5A

Great for the octaves-with-notes-in-between onehand "noodling" as we call it.

It is sometimes used along with a bit of the 4' as well, to taste. Of course, the famous Hammond Chorus provided by the scanner circuit, makes for a dramatic and animated sound. Leslie on full stop when doing this.

I doubt it has anything to do with pipe organ registrations at all.


--Mac