Doepfer

Argh ... awful typo:
 > Do touch P1, P6, and the octave switch while doing these adjustments.
This must read: "Do NOT touch P1, P6,...."



Am 30.10.2014 13:49, schrieb Florian Anwander fanwander@mnet-online.de 
[Doepfer_a100]:
> Hello
>
> Am 30.10.2014 04:54, schrieb sj230962@gmail.com [Doepfer_a100]:
>> 1. I set [SW1] to 0= middle, and [P1] to 5 =middle to start with.   I
>> then checked the range of [SW1] by turning +/- 2 octaves and tried to
>> calibrate with [P5] - the range potentiometer.  Whilst the tracking was
>> a little off +/- 1 octave from 0 (ie 20-40 cents), by +-2 octaves the
>> offset had increased to over 100 cents.  How can I adjust [P5] so that
>> the range steps are equal...?  I didn't seem to find any setting that
>> gave even close to a 1 octave per switch movement.
> You first have to be sure that the general octave tracking is perfect.
> (trimmers P7 and P8). This has to be done using your MIDI/CV-interface
> or your standard CV-keyboard. Do touch P1, P6, and the octave switch
> while doing these adjustments.
>
> Unless this octave tracking works perfect for all four VCOs you should
> not start with the range adjustment of the octave switch.
>
> After you verified that this general octave tracking is good, you can
> adjust the tracking for the switch with P5. This may come close to
> perfect, but not really perfect.
> The reason therefor is: Unfortunately the tracking of the octave switch
> depends not only on P5, but also on the relation between the resistors
> R1(+R1'), R2, R3(+R3'). Their outcoming resistance of their combination
> has to have an exact relation of 1:2:4. It is unimportant whether the
> individual resistors are exactly 150k. But it is very important, that
> these resistors are truely equal within each other.
>
>
>
>> 2. Dumbass question, but should the VCOs be producing C with [P1] at 0
>>    = fully anticlockwise, or at 5=middle position ?   My 4 VCO's all seem
>> to tune closer to A at [P1] = 5 = middle position.
> Simply adjust it with P6
>
> Florian
>
>
> PS:
>   > Malaysia isn't a hotbed of analogue synth aficionados.
> I once had the opportunity to buy a Jupiter 8 from Malaysia -
> unfortunately I was not successful. But from the communication with the
> seller it seemed, there are is a vivid music scene.
>
>
>
>
> ------------------------------------
> Posted by: Florian Anwander <fanwander@mnet-online.de>
> ------------------------------------
>
>
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