SV: Re: [sdiy] Analysis of frequency variation in analogue synths

[karl dalen]

As a friendly reminder:

Nick and other check the sdiy archive there are plenty of discussions
on this topic to give you some additional grey hair straws.

KD
--- Nicholas Gregorich <nicksdsu at mac.com> skrev:

> On May 3, 2007, at 2:41 AM, Tom Wiltshire wrote:
> 
> > Although I've heard much heated debate about VCOs being better than  
> > DCOs (or not) and many presentations of the reasons that this might  
> > (or might not) be the case, there isn't a great deal (notice I'm  
> > not saying none) of actual experimental data showing measurable  
> > differences. What does the frequency/phase drift on a VCO look  
> > like? Show me a trace! How much comparator jitter is there on a  
> > Moog VCO? Give a percentage! Unless I can measure and identify  
> > these effects, I don't stand a chance of trying to emulate them in  
> > a digital oscillator, which is my ultimate motivation for all this.
> 
> This reminded me of information from Dave Smith via Dave Bryce.  
> Regarding the choice of DCOs instead of VCOs in the evolver, Dave  
> Smith's claim is that a VCO and DCO output signal are  
> indistinguishable on a scope. While this may or may not be true, the  
> ears not eyes should be the ultimate judge. The sound of an evolver  
> DCO (through open VCF, VCA etc) did not sound as warm/thick/analog as  
> other synths I have here featuring VCOs (through open VCF, VCA).
> 
> [This brings up the point of testing a synth waveform with and  
> without the VCF/VCA to see/hear if there is a significant amount of  
> color added by those circuits even when they are all the way open.]
> 
> In addition Dave Smith's claim depends what VCO he was comparing to.  
> If a CEM VCO (seems safe to assume this would be his baseline) is not  
> as warm as other VCOs, it may be easier to make a DCO emulate them.
> 
> You might try and find information about the analog/slop parameter  
> that is included on Dave Smith's evolver, it may give you a head  
> start on what has been done to reduce the sterile sound of the DCO.
> 
> Regarding the last sentence quoted above, I think if you do  
> successfully measure and document what makes a VCO sound like a VCO  
> and implement it in software, you should be able to sell a lot of  
> whatever you make. ;)
> 
> Nick.
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