Yamaha CS80

hi Guys

 

I recently posted some words to arturia about cs-80 emulation with statements on oscillators: Xavier Oudin, one of the head developer there replied me ; I addressed him to the useful studies Crow made on the IG series chips ...here's the mail :

 

 

>begin quote

 

Hello Max,

Thank you for this interesting link.
I think I will update my oscillator algorithm to achieve this feature.

Best regards
Xavier

> Hallo
> 
> Some days ago I was in the kvraudio.com forum and I was reading
> something about the new comer Arp2600V ; a guy wrote about the fact
> that each model shares the same vco model : in fact he received a mail
> from you
> 
> *Quote:*
> _The oscillator algorithm is the same in all our synthesizers. BUT the
> parameters of this algorithm are not ! rising edge, the instability,
> the drift are completely different. MMV and ARP are much closer than
> ARP and minimoog V, but there are differences.
> >end quote<
> 
> This is a good thing but I think that the developement could now be
> more specifically addressed to the waveforms themselves. I wish this
> could be made for CS-80V ( I just bought a copy of it) : the hardware
> version  has some very particular waveforms , I discovered it by
> looking at a CS-80 expert and restorator site  of Chris Rider aka "Old
> Crow" : he reverse-enginereed the synth's circuitry and built some
> analog reproduction of the original IG chips made for VCO and filters
> and built some discrete versions of this model. The saw waveform
> results has a little pulse on its edge and the square waveform has a
> curvilinear edge : this waveshapes result also from the service manual
> of the original so they made *intentionally* these waveform to achieve
> a more rich in harmonics sound
> 
> check out
> 
> http://www.cs80.com/vco.html
> 
> (old crow's page about the custom built cs vco)
> 
> You can contact him and see if he could make up another VCO model for
> you for study purposes
> 
> If the oscillator design would be exactly the same , the machine would
> be* MUCH MORE cpu efficient*, seen that only TWO oscillators and NOT
> FOUR will be running !!
> 
> Also I would suggest
> 
> http://launch.groups.yahoo.com/group/yamahacs80/
> 
> to share opinions with many CS80 owners and restorators
> 
> friendly yours
> 
> Max from Italy
> 
> 
>

>end quote

 

Greetz!
max

----- Original Message -----

From: MARK GRIFFITHS

To: yamahacs80@yahoogroups.com

Sent: Monday, December 20, 2004 5:48 PM

Subject: Re: [yamahacs80] arturia feedback

Well done Max, nice to see something constructive come out of that thread! I'm also a MMv and CS80v owner..perhaps you might like to post this also in the CS80v forum too?

 

all the best, Mark

Max Fazio <faxiomas@...> wrote:

hi Guys

 

I recently posted some words to arturia about cs-80 emulation with statements on oscillators: Xavier Oudin, one of the head developer there replied me ; I addressed him to the useful studies Crow made on the IG series chips ...here's the mail :

 

 

>begin quote

 

Hello Max,

Thank you for this interesting link.
I think I will update my oscillator algorithm to achieve this feature.

Best regards
Xavier

> Hallo
> 
> Some days ago I was in the kvraudio.com forum and I was reading
> something about the new comer Arp2600V ; a guy wrote about the fact
> that each model shares the same vco model : in fact he received a mail
> from you
> 
> *Quote:*
> _The oscillator algorithm is the same in all our synthesizers. BUT the
> parameters of this algorithm are not ! rising edge, the instability,
> the drift are completely different. MMV and ARP are much closer than
> ARP and minimoog V, but there are differences.
> >end quote<
> 
> This is a good thing but I think that the developement could now be
> more specifically addressed to the waveforms themselves. I wish this
> could be made for CS-80V ( I just bought a copy of it) : the hardware
> version  has some very particular waveforms , I discovered it by
> looking at a CS-80 expert and restorator site  of Chris Rider aka "Old
> Crow" : he reverse-enginereed the synth's circuitry and built some
> analog reproduction of the original IG chips made for VCO and filters
> and built some discrete versions of this model. The saw waveform
> results has a little pulse on its edge and the square waveform has a
> curvilinear edge : this waveshapes result also from the service manual
> of the original so they made *intentionally* these waveform to achieve
> a more rich in harmonics sound
> 
> check out
> 
> http://www.cs80.com/vco.html
> 
> (old crow's page about the custom built cs vco)
> 
> You can contact him and see if he could make up another VCO model for
> you for study purposes
> 
> If the oscillator design would be exactly the same , the machine would
> be* MUCH MORE cpu efficient*, seen that only TWO oscillators and NOT
> FOUR will be running !!
> 
> Also I would suggest
> 
> http://launch.groups.yahoo.com/group/yamahacs80/
> 
> to share opinions with many CS80 owners and restorators
> 
> friendly yours
> 
> Max from Italy
> 
> 
>

>end quote

 

Greetz!
max