On Wed, 2012-08-22 at 00:11 +0200, Nick Copeland wrote: > > Subject: Re: [LAD] Plugin 1/oct frequency controls (AMS/MCP/VCO) > > From: [email protected] > > To: [email protected] > > CC: [email protected]; [email protected] > > Date: Tue, 21 Aug 2012 16:59:03 -0400 > > > > Yes, but as already mentioned, for a modular to be usable a standard > is > > required. The analog synths on which this was modeled have such a > > standard. As it turns out, that was based around A as well, just dug > up > > by Robin Gareus on IRC: > > > > https://en.wikipedia.org/wiki/CV/Gate > > > > Even volts on A in both schemes. > > > > > That is a nice page but it definitely does not advocate any attachment > of > semantics (eg, frequency) to any specific voltage. It gives some > tables making > voltage comparisons between V/O and H/V using integral values however > these are given as examples of the translations between the two > systems > based on the preconfigured generation of a given frequency by an osc.
It clearly shoes a mapping between volts and absolute frequencies. That there is tuning involved which can modulate the center slightly doesn't matter. The plugins in question also have frequency modulation inputs that can be used for tuning. In the synthesizer as it is working, a voltage is representing an absolute frequency. This is inevitable, because... well, you need to represent an absolute frequency with a voltage when all you have is voltage to convey information. You are correct that it is not set in stone, but it is representing an absolute frequency regardless. Fact: In a real-life genuine analogue Moog, even volts are A, e.g. 4V is A4, or 440Hz +/- tuning. How about a diagram: note.frequency_out ------A------> osc.frequency_in There are 2 possible scenarios here: 1) A carries a representation of an absolute frequency, and both "note" and "osc" agree on what that representation is 2) Your synthesizer does not work It doesn't matter, or even really make sense, to argue about where the semantics of the signal on A "came from". They are there. -dr
signature.asc
Description: This is a digitally signed message part
_______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
