Changing A=440 to A=442

joseluis · Post by **joseluis** » Fri Mar 20, 2009 9:47 pm

Hi!
How do I change the tuning of a Finale project, for example from A=440 into A=442 (or any other value?)

Thank you for your help!

Peter Thomsen · Post by **Peter Thomsen** » Fri Mar 20, 2009 11:16 pm

You can change the tuning with an expression with playback effect "Pitchwheel".

To raise the tuning from "A = 440 Hz" to "A = 442 Hz", set the Pitchwheel value to 54.

joseluis · Post by **joseluis** » Sat Mar 21, 2009 9:54 am

Peter Thomsen wrote: To raise the tuning from "A = 440 Hz" to "A = 442 Hz", set the Pitchwheel value to 54.

Thank you Peter. I understand that:
- with pitch wheel at "0" The system pitch is A=440
- pitch wheel at 54 raises the pitch 2 Hz, so I can use this proportion for any other pitch desired: 0.03 Hz/wheel unit.
- by the same token, for A=420, I should set the wheel to: -30/0.03 = -1000 units

Is this correct?

Peter Thomsen · Post by **Peter Thomsen** » Sat Mar 21, 2009 7:15 pm

No, what you have written is not correct.

The relation between the Hz value and the Pitchwheel value isn't a linear function, but rather a logarithmic function.

For a tuning in [A = x Hz] the Pitchwheel value is

8192 * ln(x/440) / ln(2)

For [A = 420 Hz] you get a Pitchwheel value of -550.

By The Way:
You don't need to understand the logarithmic function ln(x).
Just let your Calculator application do the calculation according to the formula above.

joseluis · Post by **joseluis** » Sun Mar 22, 2009 12:23 am

No problem with the calculation.
Now it is clear. Thank you very much.

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