Discussion about the Korg PolySix synthesizer

What about a polysix that takes... 5 mins for just a SINGLE voice to be in tune (the other 5 are in tune as soon as you switch it on)? Obviously it's IN tune as it ends up in tune, but the fact it's only ONE voice (always the same one!) that has a delay 'warming up' does it hint a fault with one of it's chips or caps? if so I'd like to fix it.

thanks

To: PolySix@yahoogroups.com
From: johau@gmx.net
Date: Tue, 22 Sep 2009 21:43:41 +0200
Subject: Re: [PolySix] out of tune?















 




    
                  How do you come along?

Here is what happens (should happen):

1) set the front panel Tune knob to center position

2) on KLM-366: set sliding switch to "normal" position (away from CN12)

    Be sure to have selected POLY Key assign mode

3) set potis VR10 (Tune Low) and VR11 (Tune High) of UNIT0

    to center position

4) tune UNIT0 (you can recognise which voice (or UNIT as they call it)

    is active by the small LED on KLM-366) in low, mid, and high range by

    poti VR2 (high), VR3 (low), VR15 (mid), and VR14 ("D# ADJ"). VR14

    does have very little impact. When tuning low notes switch the

    OCTAVE setting on the front panel to 16', when tuning high note set

    it to 4'. Use a chromatic tuner.

5) once you are satisfied with UNIT0 (it will NOT be 100%!) proceed to

    UNIT 1. Dont touch the common potis VR2, VR3, VR14, and VR15; just

    VR10 and VR11 of each UNIT. Do not use the tuner for that but rather

    tune it to UNIT0, observing the effect of tone beating. You have to

    play UNIT0 and the UNIT you want to tune.

6) If you are through with all 6 UNITs set up a "chord" of six equal

    notes using the HOLD mode and press CHORD MEMORY. Now play notes

    over the whole range (low 16' .. high 4') and listen. All 6 voices

    sound simultaneously. But in contrast to UNISON mode the voices are

    not detuned but "equal". Still they will not be equal 100% over the

    whole range. It is 6 independent oscillators with true analog

    circuitry, which will not be 100% perfect.

    If you are satisfied with the precision set SW1 to the "Stretch

    Tuning" position (towards CN12). Now the tuning is set intentionally

    off a few cent over the whole range, you can check this with the

    tuner. This adds richness to the sound as the 6 voices start (even

    more) beating.



I hope this helps.



Johannes



blindcatfishwillie wrote:

> Hi,

> I've searched all I can on this great forum but I still can't figure out how to get by polysix back in tune.  Andrew did a spectacular job restoring the CPU board but now I need to give attention to the tuning board.  I have the service document but can't make much sense of it.  It seems too many things are out of spec to make it work.  There is a post from Johannes stating:

> 

> "5.) Now start to tune UNIT0. Take the adjustment procedure as a hint

> of what will happen when you turn certain potis"

> 

> I just can't figure out what pots to turn to make what happen.  The problem (and I should have stated this earlier) is that an octave in sound stretches more than an octave worth of keys.

> 

> Thanks for any guidance or offers of help!

> 

> Jesse Olley

> 

> 

> 

> ------------------------------------

> 

> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6Yahoo! Groups Links

> 

> 

> 



 

      

    
    
	
	
	
	


	


	
	 		 	   		  
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