Xpantastic!

Hey All,

I have had some problems with tuning on my Matrix 12 maybe this can 
help:

I know the first impulse is always the CEM chips but I have found 
that there is a bypass capacitor at the output of each voice that 
will 
fail and cause the VCO or the VCF to intermitantly fail the tune.  
This makes sense because if the OB can't read back any frequency from 
the voice it will fail. These beasts are getting on in years and 
capacitors are usually the first thing to go in any electronic 
device. 
BTW I have found this to be the problem on many older synths. (Poly 
Moog, Memory Moog etc..) 

Other times if the patch is very complicated, lots of mod 
routings with LFO's modulating themselves etc.. then the auto tuning 
may also fail. Try switching to a more generic patch or the INIT 
patch and try again.   

Karl II

I'll try that when I get round to servicing it...for the moment I 
found that voice 3 consistently failed the resonance and VCF tune, I 
swapped the CEM around with voice 4 and now it tunes fine.

--- In xpantastic@yahoogroups.com, "Karl" <shire03@...> wrote:
>
> Hey All,
> 
> I have had some problems with tuning on my Matrix 12 maybe this can 
> help:
> 
> I know the first impulse is always the CEM chips but I have found 
> that there is a bypass capacitor at the output of each voice that 
> will 
> fail and cause the VCO or the VCF to intermitantly fail the tune.  
> This makes sense because if the OB can't read back any frequency 
from 
> the voice it will fail. These beasts are getting on in years and 
> capacitors are usually the first thing to go in any electronic 
> device. 
> BTW I have found this to be the problem on many older synths. (Poly 
> Moog, Memory Moog etc..) 
> 
> Other times if the patch is very complicated, lots of mod 
> routings with LFO's modulating themselves etc.. then the auto 
tuning 

> may also fail. Try switching to a more generic patch or the INIT 
> patch and try again.   
> 
> Karl II
>