Yamaha CS80

There are filter adjustments on every Master board on the opposite side
from the tuning adjustments.4 pots adjust the lpf and resonance level
and hpf and resonance level...this would coincide with results that the
"seventh" in rotation is less bright....However given that it only
happens on certain presets it could just be lower levels from the
filtered waves mixed with a louder sine wave with the overall volume
lower.....I would make a preset testing out just sine levels and seeing
if they are similar...then just wide open white noise anf listening for
level or filter differences.... then sawtooth with the same test and
finally just square wave with pulse width  down lastly pulse width
full......use the same proceedure to find the culprit M board as you
would for tuning.......I have a jpeg of the M board with adjustment
procedures here somewhere.......If the filter is the culprit...the
sawtooth squaewave and white noise should experience the same drop in
brightness.....Happy hunting

Quazimodo wrote:

>  Hi guys,
>
> I'm shortly going to renew my power supply caps, been meaning to do
> that for some time now.... And also do the tuning procedure.
>
> Many thanks for all the replies recently about knowing which card is
> operative.
> But I have another question since playing her yesterday...
>
> I noticed that on Channel II, every 7th key press does not sound as
> 'bright' as successive presses before and after. Now this only happens
>
> on certain voices, for example the Organ preset or String presets on
> the same channel sound OK. Interestingly, if I press this note harder
> I can get it to sound as bright as the others - but something is
> deffinately amiss here.
>
> I assume it's to do with a voice that has a certain parameter enabled
> within the patch...?
>
> Anyway, my question it, could this be just an adjustment I can tackle
> on the relevant voice card? Maybe the filter is not as *open* and I
> can open it to match the other voices?
>
> Thanks for any pointers.
>
> Cheers.
> TOM
>
>
>
>
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