Yamaha CS80

Errant triggers are caused by contact bounce, which is due to two 
things.  First is the design of the weighted action itself.  While 
well-balanced, each key ultimately strikes a small rubber pad,which is 
in fact the force-sensing resistor array's cover delivering that 
immaculate aftertouch.  This results in a small bounce of the far end of 
the key's 'rib' which is where the actual switch(es) are.  At times this 
bounce can cause a retriggering of envelopes.  Second is the age of the 
switches.  Their design is going to last a hundred years, but contacts 
do wear down, and they are already 30 years old.  A little less contact 
facing means a slightly wider contact gap, and a wider gap means the 
above mentioned bounce has a greater chance of retriggering a note 
envelope/rotation.

  I tinkered with a corrective circuit, but am unsure if the correction 
is 'better' (essentially a one-shot with a time of 50ms or so for each 
trigger switch--16 in all).

Scott
/**/

JH. wrote:
>> I noticed some of your keys double-trigger the notes like mine does.
>> How can we fix that?
>>     
>
> I've no idea.
> It doesn't bother me much, though. As long as I don't get _wrong_ notes.
> But I sometimes get them; I suspect when a bouncing key triggers the first voice not long enough to fully charge the capacitor of the S&H?
>
> JH. 
>