Yamaha CS80

I have the same thing with my CS80.  It goes away when I turn the IL 
and AL down all the way on the filter. The envelope never seems to 
reset otherwise on that voice for the VCF.  Do you have a kenton midi 
kit installed?  I do.  I wonder if it has something to do with that, 
or if this is normal.



--- In yamahacs80@yahoogroups.com, rj krohn <r_j_d_2.phila@...> wrote:
>
> hi guys, im hoping someone here can help me calibrate my LAST VOICE 
OF MY CS80! (along with the kind help of steve sloan, i am hoping to 
have her 100%).
> 
> the diagnosis(i dont have a voltage generator, so i have to do this 
by ear, but otherwise i am following the factory procedure):
> 
> -on presets or sounds that involve an envelope, this one voice does 
a thing that basically sounds to me like the envelope opens, but just 
doesnt close. example, on the "funky" presets, this voice sticks WAY 
out(HPF fully open in sustained note mode), as the normal voices EG 
close, leaving a low filtered note. this "bad note" sounds like one 
of the string presets, to give you an impression. on sounds that dont 
rely on a large EG sweep, you dont notice it. but about 1/2 of the 
presets do, so its VERY noticeable.
> 
> -i know its not the IG00152 chip. thought it was, but swapped with 
a working chip, and i get same results.
> 
> -trim pots VR18,15, and 19-when i sweep through VR15 and VR19, 
ESPECIALLY the "sustain level"(vr15, i believe) i dont seem to get a 
huge range of difference. i was able to get the ATTACK calibrated 
properly with VR18, but there is no trim pot for DECAY, which is 
really what my problem is. this voice has an infinite decay, 
basically.
> 
> -i measured all 3 of the VCF EG trim pots on a DVM, and they all 
have a resistance range of roughly 0 to 25k-50k, depending on pot. so 
they may not be FULLY functioning, but they are definitely not dead.
> 
> 
> im totally stumped here.  any guesses? thanks alot guys!
> 
> -rj
> 
> 
> 
> 
>        
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