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Can someone please explain the moog 1v/octave standard?
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slow-hand



Joined: Jun 16, 2009
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Location: Israel

PostPosted: Tue Jul 07, 2009 1:50 pm    Post subject: Can someone please explain the moog 1v/octave standard? Reply with quote  Mark this post and the followings unread

So what I know is that a single octave is devided into 12 "equally" spaced notes. According to classic tuning this means:

C = 1
C# = 1.067
D = 1.125
...

According to more modern equal temperament:

C = 1
C# = 1.059
D = 1.122
...

So 1v/octave could be either one... According to the just intonation C# is 16/15 and accoring to equal temperament C# is 2^1/12. If we are starting at 0v I can simply shift everything down by 1v, but which one is the "correct" voltage output used?
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blue hell
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PostPosted: Tue Jul 07, 2009 4:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm not sure I'm interpreting your question correctly ... but there is no such thing as a "correct voltage" I'd say. That being said a keyboard will usually be tuned to equal temperament, but the 1 V/octave system does not care, any tuning could be used.

The voltages you calculated (?) are off (or I misunderstood your post), as 1 V / octave would just mean (1 / 12 V) / semitone (or about 83 mV) for an equal tempered scale, as the system maps a linearly varying voltage on an exponentially varying pitch (the expo converters in VCO / VCF modules will do that).

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