[sdiy] Basic core designs of commercial analogs

[Magnus Danielson]

From: "jhaible" <jhaible at debitel.net>
Subject: Re: [sdiy] Basic core designs of commercial analogs
Date: Tue, 24 Dec 2002 13:37:57 +0100

> > > I think this is in reference to the point you made once that a nice
> > > feature of linear VCO control is that it's easy to detune oscillators
> > > for a chorus effect where the beat frequency is constant whatever the
> > > pitch.
> > >
> > > I'm sure several of us sat back and thought, "Hey, that makes a lot of
> > > sense.  A linear frequency offset is a great VCO feature from a user
> > > interface standpoint.  Sometimes you really want to be sharp by 5 Hz."
> >
> > Exactly! Thanks Don for also recalling it! ;O)
> 
> 
> Ah, I see. "Linear Detuning". I'm still doing this all the time (;->).

See! I told you! You are the promotor for this feature!

> I didn't make the connection to "modulation", because it's just an
> adjustable DC offset.

Well, that's a DC modulation. The "Linear Detuning" as described by you
is infact an unscaled linear FM, DC modulated, but hey, that's still
modulated in my mind.

In a musical sense you could view the unscaled linear FM/Linear detuning
as being an equalent tempered scaling since the wowing has the same
speed regardless of what key is played. The (normal) scaled linear FM is
not equaly tempered since the wowing speeds up for higher keys.

Cheers,
Magnus