Yamaha CS80

From: Richard Atkinson <rga24@...>
Subject: Re: [yamahacs80] warm-up time CS80
Date: 08 Nov 2007 08:40:58 +0000
Message-ID: <Prayer.1.0.18.0711080840580.29148@...>

> On Nov 7 2007, David Rogoff wrote:
> 
> >The Yamaha VCOs are linear (Hz/volt), which don't need the exponential
> >converter found in more usual exponential VCOs (volts/octave) used in
> >most synths. Exponential converters are very temperature sensitive, so
> >the CS80 is actually much more stable than synths like the Prophet 5,
> >which always need some kind of auto-tuning circuits.
> 
> But doesn't a linear (Hz/Volt) synthesizer with a keyboard nearly always
> have an exponential convertor in it to convert the control voltages coming
> from the keyboard or voice assigner DAC (which are 'linear' in nature, as
> in 0 1 2 3) to exponential control voltages (as in 1 2 4 8) for the linear
> VCOs?

Well, those that do use them wisely, so what you only get is a shift of scale
for modulation, but the pitch isn't greatly affected as the minimal modulation
causes a very small shift in current.

The MS-20 clearly does this. It also drops the tempco resistor as the
modulation won't need it.

Cheers,
Magnus