Discussion about the Korg PolySix synthesizer

>>> From Johannes
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.
>>>

This is so illuminating!  I was always confused by the part of the tuning procedure involving SW1 because (a) I couldn't figure out what the switch was doing, (b) I didn't know what the manual meant by "stretch tuning", and (c) the manual tells you to move SW1 "away from VR1" which is not possible since VR1 is to the *left* of this up-and-down switch.  So confusing!

Luckily, Johannes saves me from my ignorance.  Again.  Thank you!

Chip

--- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@...> wrote:
>
> 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
> > 
> > 
> >
>