[sdiy] Interesting article on top octave generators.

[Gordonjcp]

On Sun, Dec 29, 2024 at 11:41:42PM +0100, Jonatan Liljedahl wrote:
> On Sun, 29 Dec 2024 at 21:15, Michael E Caloroso via Synth-diy <
> synth-diy at synth-diy.org> wrote:
> 
> > TOG or discrete dividers from a single master oscillator aren't going to
> > produce a perfect equal tempered scale because the interval between equal
> > tempered semitones isn't an integer ratio (the interval is an irrational
> > number = 12th root of 2).
> >
> 
> Just like juno-style DCOs, which we all love anyway :)
> 

It's interesting that the Juno 106 oscillators (they're VCOs really, hard-synced to a digital clock) are generally about 1.5-2 cents sharp with the tuning set to dead centre zero, over most of their compass. They're about a cent flat in the lowest octave and rapidly stabilise at about 1.5-2 cents, and then are wildly out to even about 5 cents sharp in the highest notes.

I doubt you'd hear that.

Anyway unlike a TOG-based system the error between notes in different octaves is not the same and there's a far more "analogue" spread of note pitches across the compass. Again, I doubt you'd hear it in real life.

-- 
Gordonjcp