Discussion about the Korg PolySix synthesizer

OK Johannes, I tried your tuning method . . . and it WORKS!  My Synth 
now is in tune. THANKS.  They should call you, like Steve Martin's 
heroic dog, "Lifesaver".  




--- In PolySix@yahoogroups.com, Johannes Hausensteiner <jo.synth@c...> 
wrote:
> The description in the adjustment procedure is for the
> "Old Production", you are right. This maps as follows to the
> "New Production" (n.b. old/new is only valid for the KLM-366 board,
> all other boards are just one version)
> 
> +------+-----+---------------+
> |  OLD | NEW |    meaning    |
> +======+=====+===============+
> Overall pots:
> +------+-----+---------------+
> |  VR1 | VR1 | tune mid      |
> +------+-----+---------------+
> |   -  | VR2 | tune high     |
> +------+-----+---------------+
> |  VR3 | VR3 | tune low      |
> +------+-----+---------------+
> |  VR4 | VR4 | EG intensity  |
> +------+-----+---------------+
> |  VR5 | VR5 | KBD tracking  |
> +------+-----+---------------+
> |   -  | VR13| KBD track offs|
> +------+-----+---------------+
> |   -  | VR14| DAC MSB adj   |
> |      |     | ("D#4 - E4")  |
> +------+-----+---------------+
> |KLM396| VR15| tune mid      |
> |  VR1 |     |               |
> +------+-----+---------------+
> Voice pots:
> +------+-----+---------------+
> |  VR6 | VR6 | VCF resonance |
> +------+-----+---------------+
> |  VR7 | VR6 | VCF offset    |
> +------+-----+---------------+
> |  VR8 | VR8 | VCF cutoff    |
> +------+-----+---------------+
> |  VR9 | VR9 | VCA adjust    |
> +------+-----+---------------+
> | VR10 | VR10| VCO tune low  |
> +------+-----+---------------+
> | VR11 | VR11| VCO tune high |
> +------+-----+---------------+
> | VR12 | VR12| EG time       |
> +------+-----+---------------+
> 
> Be sure to move the sliding switch towards the back, which is normal
> tuning, when doing the tuning procedure. The service manual is not
> clear in this point (maybe better for "Old Production"). When 
finished
> you (may) move it towards the front and enable the stretched tuning.
> You can verify the tuning mode easily with a tuner when playing a 
high
> note: when switching the sliding switch back and forth the lower 
pitch
> is normal tuning, the higher pitch is stretched tuning, which adds 
even
> more richness and movement to the sound.
> 
> I do it this way:
> 1) move the overall tuning pots VR2, VR3 (hi, low) to center 
position
> 2) move VR10, VR11 of unit 0 to center position.
> 3) now tune unit 0 with the overall pots, using a chromatic tuner.
>     this can be a little tricky, as all pots are influencing each 
other.
>     you may adjust VR10 and/or VR11 to gain perfect tuning at 
low/high
>     notes.
> 4) use (overall) pots VR14, VR15 to find the best compromise in
>     deviation from ideal tuning during the whole scale (dont forget 
to
>     change the footage switch on the control panel; i.e. the lowest 
note
>     is C0 at a 16' setting, the highest not is C5 at 4')
> 5) when satisfied with tuning unit 0 take a break; your ears will 
need
>     it!
>     check that pots are about in the middle; none should be cranked 
to
>     one edge; you can get into trouble later on!
> 6) then tune units 1..5 *to unit 0*! dont tune units 1..5 
individually!
> 7) check tuning with a 6-voice-same-note-chord in chord memory
>     Dont be disturbed that you cannot make it perfect! It is 6
>     *independent* oscillators with analogue circuitry - they never 
will
>     be 100% perfect. After all, thats what we folks want!
> 8) Switch SW1 to front position and enjoy the "Schwebung" (dont know
>     the English word..) created by the stretched tuning. Note the
>     difference between the 6-voice-same-note-chord and Unison mode!
>     Thats ... extraordinary!
> 
> Btw. if you are in this that deep you may remove D1 from KLM-366. 
This
> gives you both Saw and Pulse wave *at the same time* in "SAW" 
position.
> You still can kill the pulse wave by turning the PW control fully
> clockwise for a saw-only setting.
> 
> I hope this helps
> 
> Johannes
> 
> 
> 
> PolySix@yahoogroups.com wrote:
> > Thanks for the reply:
> > 
> > I have the procedure form the manual, and it was very unclear, and
> > referred to VRs that did not exist and did not refere to ones that 
did
> > (The old verses new production problem.)  Mine is a new production
> > board.  What do each of the VR's do?     On the 367 board there 
are VR1,
> > VR2. VR3, VR4, VR14, a D#-E4 VR, etc.
> > 
> > Any help is appreciated.  
> > 
> >