Yamaha CS80

The service manual is here:

http://www.emusic-diy.org/YamahaManuals

CS-60 / CS-80 style pitch bend changes the reference voltage connected to the tune knob, and thus the keyboard bus and the oscillator. If you want a CS-60 / CS-80 style pitch bend (linear pitch bend), adapt the circuit from the CS-60 or CS-80 and apply it to the tune knob in place of +15V (page 7).

The vibrato input on the SY-2 oscillator module is I think an exponential FM input (page 8). In the SY-2 it's driven by the vibrato controls and also by the initial pitch bend function. Adding a variable control here would allow the more conventional exponential pitch bend as known from synthesizers with exponential oscillators.



From: rj krohn 
Sent: Monday, October 27, 2008 5:59 PM
To: yamahacs80@yahoogroups.com 
Subject: Re: [yamahacs80] Re: Yamaha SY-2


i have one as well. richard, i'd be curious to here where the tap-in point could potentially be for a pitch bend. wouldnt a ribbon controller be awesome on one of these? i'd drop 50 bucks
on one of the cs80 replacement ribbons, if they were available, to put one on mine.-rj

--- On Fri, 10/24/08, Richard Atkinson <rga24@...> wrote:
From: Richard Atkinson <rga24@...>
Subject: Re: [yamahacs80] Re: Yamaha SY-2
To: yamahacs80@yahoogroups.com
Date: Friday, October 24, 2008, 9:57 PM

You could change some resistors and adjust the range of the tune knob. Or you could add a control to adjust an offset on the VCO module's vibrato input.

From: cuari7 

Sent: Friday, October 24, 2008 2:25 AM

To: yamahacs80@yahoogro ups.com 

Subject: [yamahacs80] Re: Yamaha SY-2

Cool!

Do you know of a mod to be able to do true pitch-bending on it (like 

with a pedal or a knob?).

--- In yamahacs80@yahoogro ups.com, "Richard Atkinson" <rga24@...> wrote:

>

> Yes, I have two. I'm currently writing a piece of software to help 

visualise (and hence learn) the 28 presets.

> 

> With two SY-2s, you can make sounds similar to one voice of the 

polyphonic manuals on the GX-1.

> 

> 

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