[sdiy] Moogey jitter

[Magnus Danielson]

From: mark verbos <mverbos at earthlink.net>
Subject: Re: [sdiy] Moogey jitter
Date: Sun, 16 Apr 2006 17:39:12 -0400
Message-ID: <4442B980.1090305 at earthlink.net>

> This low frequency noise that effects the reset comparator and the 
> integrator slope would also effect the DC location of the saw wave from 
> the core output , wouldn't it?

Yes. Notice also that the Franco compensation also affects the DC offset, at
higher frequencies it shifts the DC up (linearly with frequency) to compensate
for the reset-time under which the capacitor is not charged. Clever in all its
simplicity. Precission-nuts should compensate this DC shift (just tap another
transistor in the expo-circuitt) or just stay away from sawtooth-core
oscillators.

> I noticed some "wavering" of my analog VCO waves and it gave me an idea 
> a while back. I opened up Pro Tools and made some raw waves with the 
> signal generator. Then, with the pencil tool, at a huge magnification, I 
> drew in a randomly moving dc offset on another track. I then mixed the 
> waves together, along with some of this red or brown noise. That didn't 
> sound like anything at all. However, when I then ran that mixed signal 
> through distortion, or waveshaping or some other effects these randomly 
> varying DC offsets really added to the analog-ness of the sound. I don't 
> know if it would qualify as "Moogy" but it did sound interesting. I also 
> tried using triangle waves that I pitched down 4 or more octaves. This 
> also had an interesting effect.

Addition of noise, DC etc. isn't as interesting as when it see any form of
non-linearity, which creates all kinds of by-products.

Cheers,
Magnus