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Table lookup will win hands down in terms of cycle count, since calculating note frequencies involves several very costly mathematical operations.
Expanding the table to 512 bytes will help squeeze a few more cycles, if needed. Generally the idea is to split low and high bytes of the lookup values, and align each table to a 256 byte border, so you can directly translate the indices, like so

   ld h,table_base_lo_bytes>>8
   ld l,a     ; set index
   ld c,(hl)   ; load lo-byte
   ld h,table_base_hi_bytes>>8   ; or just inc h if hi-byte lut follows on next page
   ld b,(hl)    ; load hi-byte, frequency divider now in BC

What exactly do you want to do? Sounds like you're trying to generate note frequency dividers. If that's the case I'd definately recommend using a lookup table. It's gonna cost you 512 bytes at most.

Otherwise, just ld a,n, add a,a, rotate the carry into another register, rinse and repeat.

and BLEO wins the thread

I dunno about the internals of chiptune=win, but hey, let's hear it for facebook-walled gardens!
https://www.cnbc.com/2018/09/05/faceboo … d-app.html

Hey, got some great tracks on there. Always nice to hear something a bit out of the ordinary.

Oh yeah, I'd be interested in those pictures as well. Everybody keeps saying the Cheetah sucks, but well... there's no way of knowing of knowing for sure except trying to use one, eh?

Fantastic release! I can hardly understand 10% of the lyrics with my crappy French but it rocks all the same