Hi,
When I do the adjustment, especially the VCO tuning, dont do it strictly
according to the serfvice manual. I do one voice starting from a center
position as the manual says, but then I tune the other voices to the
first one. It is easier to do because of the tone beating ("Schwebung")
and the result is better than tuning each oscillator seperately. But my
experience is that you cannot make it 100% exactly. - But it's analog!
That's why we love it.
The graphs show the maximum pitch deviation (tolerance) in Cent versus
the note pitch, which should be in the gvie limits. Normally you would
not care too much about those graphs but set it to "best compromise".
Regarding the "accent": Do the adjustment as told in the service manual
(section 4.8). This gives satisfactory results. If you dont have an
oscilloscope you have to use your ears...
Good luck!
Johannes
Benjamin Wild wrote:
> hello,
> I just midified (verry simple: only midi in / note on/off) my polysix.
> now, I'd like to tune each voice and adjust the filter parameters.
>
> - when I do an apreggio I hear 5 even/slightly detuned sounds and one
> with an accent..
>
> here is a text version of the service manual.
> could you comment it / tell me you experiences ..
>
> benjamin wild
>
>
> 4.7. Pitch check and adjustment:
> --------------------------------
> Set OCTAVE to 4'; leave others at normal.
>
> 4.7.1 Change circuit board slide switch (SW1) to opposite position
> (away from VR1).
>
> 4.7.2 Play C6 and adjust VR11 to obtain 0 cent.
>
> 4.7.3 Repeat step 4.7.2 for units No. 0 .. No. 5.
>
> 4.7.4 Play C2 and adjust KLM-396 VR1 (= KLM-366 VR15) to obtain 0
> cent. Do this for one unit.
>
> 4.7.5 Set OCTAVE to 16', play C2 and adjust VR10 to obtain 0 cent.
>
> 4.7.6 Repeat step 4.7.5 for each unit. (VR3 is used to adjust for
> deviation of all units).
>
> 4.7.7 Play C1, C2, C3, C4, C5, and C6, and confirm that each unit's
> deviation is within specifications. (Refer to Poly-6 deviation standards).
>
>
> 10 | \____
> | \____ __
> 5 | \____ ____/
> | \_________________________________/
> |
> 0 +----------------------------------------------------------------
> C0 C1 C2 C3 C4 C5 C6 C7
>
> |<----------------- 4' ---------------->|
> |<----------------- 8' ---------------->|
> |<---------------- 16'----------------->|
>
> PS-6 VCO octave deviation standards
> at the final inspection at our factory
>
>
> 4.7.8 Check to confirm that deviation between adjacent octaves
> is within specifications. (For unit 0 only).
> (Refer to VCO adjacent octave deviation standards).
>
>
> +10 |
> | ___ |
> | \___ |
> | \___________________________________
> | \______
> 0 |________________________________________________________________
> | ______
> | ___________________________________/
> | ___/ |
> | ___/ |
> -10 |
> C0 C1 C2 C3 C4 C5 C6 C7
>
> |<----------------- 4' ---------------->|
> |<----------------- 8' ---------------->|
> |<---------------- 16'----------------->|
>
> PS-6 VCO adjacent octave deviation standards
> at the final inspection at our factory
>
>
> 4.7.9 Confirm that difference between 4' D#4 and E4 is within
> 2 cents. (Switch between POLY and UNISON and check unit 0 only).
>
> 4.7.10 Switch SW1 to the front while playing C6 (stretch tuning)
> and confirm +8..+12 cent.
>
> 4.7.11 Confirm difference of no more than 2 cents between 4' G5 and
> G#5. Unit 0 only is OK.
>
> 4.7.12 Confirm that KLM-366's VR1 is approximately in the center
> position and not turned in the clockwise or counterclockwise directions.
>
>
>
>