[sdiy] Interesting article on top octave generators.

[Richie Burnett]

That is a curious shape indeed.  I had imagined all of the pitches would be 
centred around the 12-tone equal temperament scale with an increasing amount 
of scatter due to quantisation of the timer periods towards the top end of 
the pitch range!

That does *look* like they were deliberately trying to tune the instrument 
to some standard other than 12-tone equal temperament.  As you said though 
the detuning is very subtle... The opposite ends of the scale (x1.005 and 
x0.999) are only 10.4 cents apart, so it would take good ears to notice this 
in isolation.

-Richie,





-----Original Message----- 
From: Gordonjcp
Sent: Monday, January 6, 2025 10:53 AM
To: synth-diy at synth-diy.org
Subject: Re: [sdiy] Interesting article on top octave generators.

On Sat, Jan 04, 2025 at 09:05:11PM +0000, Mike Bryant wrote:
> I've always shipped my custom 'all digital since 1984' synths with 
> Railsback as one of the tuning options.  I know that it has definitely 
> been used on several film scores.
>

So, now I know what the term "Railsback" is.

Let me show you an interesting thing:

https://gjcp.net/images/junotuning.png

This is a comparison of the divider coefficients in the Juno 106 voice board 
ROM with a "perfectly" tuned twelfth-root tuning.

It's kind of the same shape, isn't it? I notice that the lowest notes on a 
Railsback tuning are way flatter and way sharper being anything up to 30 
cents different, and I'm not convinced that I can hear a difference between 
"ROM" tuning and "perfect" tuning.

I suppose that's another experiment to add to the pile, eh?

-- 
Gordonjcp

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