Discussion about the Korg PolySix synthesizer

On 05.09.15 23:40 , backshall1@bellsouth.net [PolySix] wrote:
>
> Are those the midi jacks way over on the right hand wood panel at the 
> end of the yellow wires? Considering they should be as close as 
> possible and preferably use shielded cable, those look like they are 
> as far away as possible and not shielded, although the tight twist in 
> the wire does a decent job of cancelling out any noise picked up.
>
I doubt that this noise is induced by interference. It is clearly a 
single signal with increasing frequency counting up to 8 variation 
directly related to the keyboard.

I think we should focus on finding the place where this kind of signal 
is generated. It must be a chip, which is addressed by three bits (or 
more more bits, where three of them are shared with the keyboard matrix) 
and it must be a chip that generates a frequency (clock, reset signal, 
... ) depending on this address.

Florian