Doepfer

Thanks Florian. Very helpful 

On my drive home tonight I figured I ought to have started with the CV tracking - you have confirmed Tutsi suspicion 

I'll keep an eye out for any analog action here in KL - although after 7 years I've only bumped into a few like-minded souls. 

Cheers 
Steve

Out of office - sent from mobile device


> On 30 Oct 2014, at 20:49, Florian Anwander fanwander@mnet-online.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote:
> 
> 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 usinge 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.
> 
>