[sdiy] scanned pots "jumping"

[cheater cheater]

Dave,
parallax mode is a way of processing the position of the knob. It
requires the potentiometer to be scanned too.

If the knobs jump around without you touching the synth at all, then
the knobs are most probably jumping because they have no lag
processor/low pass filter applied to them. If the knobs jump around
when you hit the keyboard hard, then it's a mechanical issue that
cannot be addressed in software.

Either way this is not something that should be happening except in
the cheapest equipment.

D.

On Wed, Feb 3, 2010 at 15:04, Dave Kendall <davekendall at ntlworld.com> wrote:
> Hi all.
>
>
> Following on from the pots/vs. encoders thing, when playing a Nord Electro
> (with scanned pots, not in parallax mode) occasionally a parameter setting
> will jump, presuambly from the vibration of the instrument being played
> hard. I've got used to leaving the knobs in a "safe' position before a gig
> in case something drastic happens, which on occasion it has..
>
> Is this a common fault with such systems? FWIW, the machine did this more
> often when it was brand new...
>
> cheers,
> Dave
>
> On Feb 3, 2010, at 00:35, Dave Manley wrote:
>
>> When an encoder becomes unreliable is it because
>>
>> 1. the switches are worn out
>> 2. the switches are contaminated and need cleaning
>> 3. the mechanical cam that operates the switches is worn out
>> 4. debris from wear on the cam/switches is blocking the switch operation
>> 5. ???
>> 6. any and/or all of the above?
>>
>> Anybody take one of these apart and do an analysis?  Does spraying cleaner
>> into an encoder really do anything?
>>
>> -Dave
>>
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