22 Aug
2012
22 Aug
'12
12:11 a.m.
Subject: Re: [LAD] Plugin 1/oct frequency controls
(AMS/MCP/VCO)
From: d(a)drobilla.net
To: nickycopeland(a)hotmail.com
CC: jef(a)synthedit.com; linux-audio-dev(a)lists.linuxaudio.org
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 ofsemantics (eg,
frequency) to any specific voltage. It gives some tables makingvoltage comparisons between
V/O and H/V using integral values howeverthese are given as examples of the translations
between the two systemsbased on the preconfigured generation of a given frequency by an
osc.
A modifying voltage carries no reference since it cannot - it is a voltage,what happens
when that voltage is applied to something is not implied inits value, it never was.
Oscillators and filters did have semantics of whatthat voltage did which is where the V/O
comes from, the reference value(which Fons describes in his email) is not a function of
the modifier.
Regards, nick.(Dave, as usual I did an inadvertant direct reply, this is copied to the
list, apologies).