Re: [AH] Thinking of trading my Korg Polysix for MKS 70 with PG800. Am I

From Murray
Sent Wed, May 1st 2013, 22:47

I have been looking into the P6 noise issue as part of my Kiwisix 
upgrade and I have managed to quieten the P6 by about 80% by adding some 
grounding wires. The ground layout on the boards is very poor and this 
is especially so on the FX board which is where most of the noise comes 
from. Unmodified the FX board is very prone to airborne interference and 
running very close to it and also the full length of it are the keyboard 
scanning wires which are pretty good transmitters as they are switched 
on and off at high speed. The Kiwisix upgrade actually made the noise 
worse as I am scanning everything much faster than the original P6. I 
have detailed in the user manual install section where to add extra 
grounds and in addition to these you also need to isolate the keyboard 
mounting leg that is touching the grounding foil that runs under the FX 
board. This is best done but cutting out a square in the foil. Even the 
power supply board is badly grounded and the power ground wires are too 
light. The best place to run the extra grounds from would be the ground 
leg of one of the large caps.


like Dave already said, the Polysix cannot be used without a noise
gate, or just you sitting at your desk and riding the fader. When it's
playing, the Polysix really takes offense at any other synths. You
can't use it with other harmonies playing in the mix; it almost always
needs to be the only synth playing, other than a simple bass line, and
unpitched drums. If you want a BD then it needs to be at the same
pitch as the bass line, and you most likely need to put the P6 through
a high-pass filter (use your EQ's low-reject). So what you want to do
is to create holes in your melody when there's nothing playing (no
reverb tails either), absolutely mute everything, then unmute the P6
and give it its time. Then mute that and unmute the rest of the track.
That's taking it to an extreme but works well. Put a track compressor
(maybe 10ms attack and 100ms release, 1:4) before the muting for a
less visible sound or after the muting (with shorter release) for a
punchier sound.