[sdiy] 'equally tempered' vco

Simon Brouwer simon.oo.o at xs4all.nl
Thu Feb 25 15:28:20 CET 2010


Needham, Alan schreef:
> |-----Original Message-----
> |From: synth-diy-bounces at dropmix.xs4all.nl
> | [mailto:synth-diy-bounces at dropmix.xs4all.nl]
> | On Behalf Of Simon Brouwer
> |Sent: 24 February 2010 23:26
> |Cc: Synth DIY
> |Subject: Re: [sdiy] 'equally tempered' vco
> |
> |Laurie Biddulph schreef:
> |> Exactly...
> |>
> |> The VCO has 3 basic sections:-
> |> 1) front-end mixer
> |> 2) core oscillator
> |> 3) wave shapers
> |>
> |> The front-end mixer has been tailored to a 1V/Octave range
> |>and this, I believe, makes it equally tempered. Replacing/
> |>modifying this front end would allow other temperaments to be
> |>catered for if I am not wrong.
> |
> |That is true as long as all semitone intervals correspond to
> |the same voltage difference of 1/12 V. But there is no reason
> |why you could not use a controller assigning a different
> |selection of control voltages to the notes in the octave.
> |There is nothing "inherent" in the ASM-1 VCO that prevents you
> |from thus using e.g. Pythagorean instead of equally tempered
> |tuning.
> |
> |--
> |Vriendelijke groet,
> |Simon Brouwer.
>
> Whilst I agree about the controller dictating tuning rather than the
> oscillator, I do think that the above implies too strongly that the VCO
> must be v/oct.

Sorry, sloppy quoting. My reaction was to the first sentence, not to the
second.

-- 
Vriendelijke groet,

Simon Brouwer



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