SynthMaker

Create octave knob

Archive · 2011 4 old posts

From the original SynthMaker forum (2004–2014), with its members’ names and dates.

CoreStyler ·

I need to use a octave selection knob. I just created a correct and working semi knob but i dont understando how to have a octave selection knob. Ex from -5 to 5... How to do?^

pall ·

Maybe this helps. 🙂

oddson ·

If you're working with pitch values than adding/subtracting multiples of 12 works.

If you're working with frequencies (normalized or raw Hz) then you can multiply by powers of two.

An octave shift of zero will multiply by 1 giving no change.

An octave shift of -1 will half the frequency.

An octave shift of 2 will quadruple the frequency.

Semitone shifts in the frequency domain are harder in that they involve the 12th root of 2.

oddson ·

If you are talking about pitch value changes and are just looking for an easy way to add subtract multiples of 12 based on the index value coming from a selector I'd recommend this as simpler and more flexible than pall's version:

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