[sdiy] was: sample rates. Where to find service manuals more easily..

[Bob Weigel]

Nice article which reminds me..I need to do the waldorf section of my 
page.. I should note in regard to anyone spending lots of time searching 
for service manuals though that I try to keep them all pointed to if 
free ones are online at sounddoctorin.com in the 'global synth' link, or 
at least someone you can buy them from if they aren't there.   Along 
with general links on units and any helpful repair hints and a general 
description of the circuitry.  More detailed in one's I've actually 
delved into.  And if anyone has submissions let me know!  The purpose of 
the site is to provide a database of information that will help preserve 
these old machines more consistently and keep people from having to 
spend so much time with them broken, but also to provide comparative 
information for people interested in getting machines for various 
purposes and to provide parts links.  Check out the SDstudio page while 
you're there.  I'm just posting the new photos of the new WALL-O-KNOBS 
:-).  Only the Memorymoog has memory on that wall. (I haven't updated 
the map yet.  Just click on one of the guitar amps against the wall 
there) -Bob

Tom Wiltshire wrote:

> Hi All,
>
> With respect to my recent question about the required sample rate for  
> digital envelopes and LFOs, I came across the following:
>
> Wolfram Franke, quoted in a review of the Waldorf Pulse, Sound on  
> Sound Feb 1996.
>
> (http://www.soundonsound.com/sos/1996_articles/feb96/waldorfpulse.html)
>
> "Digital machines and digitally-controlled analogue synthesizers  
> always suffer from one problem: they are slow at processing  
> modulation, either digital or analogue. On the Pulse, we developed  
> control voltage generators that are really fast. The modulation  
> update is 523 times per second, which means that each modulation gets  
> updated every 1.9mS. This gives you envelopes with analogue feel and  
> digital control."
>
> The same article mentions Tom Oberheim's Marion Prosynth in passing,  
> which it says "has an update speed of 16 to 22mS!".
>
> So there you go. 523Hz is 'really fast' according to at least one  
> important and influential figure in synthesizer design. The MSR2 and  
> Prosynth envelopes are both notoriously lazy, but at a rate of  
> 50-60Hz, I'm not surprised.
>
> Regards,
>
> Tom
>
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