Discussion about the Korg PolySix synthesizer

Thanks for the quick replies!

After reading the manual I got more insight as to how tweaking works for this synth. I found out that while tweaking knobs it takes extreme movements to over-right the original settings on a patch. 

With this in mind I started to play with the ADSR and it seems that they are actually working quite well. The attack and decay may need  a tweak as the range in which they work in seems a little off. It seems like between 0-4 it does little to the sound then between 4-7 it changes dramatically and then past 7 it dies off again. Not sure if thats how its supposed to be, Ill have the video ready in a little bit to show what I mean. The Sustain and Release seem to work fine after using the method mentioned in the manual to reset their state.

Also, I did the voltage test on IC7, its funny because as I was doing it the EG started to work. It does read from -5 to +5 on pin one. As I was doing the test I noticed that it was changing the sound. I looked more into it and I guess I just didnt play with it enough because the cutoff setting seems to determine how well this knob works. Once I moved the cutoff around the EG started to make a bigger difference. 

So I guess this problem was just me not knowing the basic function of this synth. 

I did record a video of me tweaking the ADSR and EG, Ill get that edited and posted later tonight.

Thanks again! 

--- In PolySix@yahoogroups.com, "Andrew Jury" <andy@...> wrote:
>
> Hi Paul,
> 
>  
> 
> Before you do anything else make sure that pin 1 of IC7 swings between -5v
> and  +5v (or thereabouts) as you turn the EG knob clockwise.
> 
>  
> 
> Cheers,
> 
> Andy
> 
>  
> 
> From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
> Paul
> Sent: 11 November 2009 00:02
> To: PolySix@yahoogroups.com
> Subject: [PolySix] A few questions about my new Poly-six
> 
>  
> 
>   
> 
> Hello,
> 
> I have recently acquired a Korg Polysix and am now in the process of fixing
> it up.
> 
> Luckily the battery problem was already done by the previous owner, all the
> broken traces were replaced with wires and a new battery was fitted.
> 
> The synth plays alright, I already took apart the key contacts and cleaned
> them but will have to go back and do it again because a few keys still dont
> work all the time. 
> 
> I also have to replace 13 of the 19 push buttons for patches and tape
> memory, I have already ordered those.
> 
> My question is about calibration. Ive tuned a much simpler Roland JX-8P in
> the past, which only had a few very simple variable resistors and took a few
> minutes. Ive Looked over the calibration procedure for this synth and it
> seems much harder. 
> 
> The reason I want to do the calibration in the first place is because Ive
> noticed that a few of the functions on the synth dont work correctly. 
> 
> The EG intensity knob doesnt change the sound at all, while all 4 EG knobs
> (ADSR) work in a way that I believe is wrong. I was going to describe it
> here but gave up as they just seem really random. I think the best way for
> me to describe them would be to make a video, which I will do later. 
> 
> Ive tested all the 10k pots on that board with a multimeter and they seems
> to all function the same: They start at 1.09k when they are all the way to
> one end and move up to about 2.9k somewhere in the middle and then back down
> to 0 on the other side of rotation. 
> 
> I should also mention that ive loaded a bank of stock presets and they dont
> seem to function correct either. I had to turn the ADSR knobs to random
> positions it seems to get any sound out of the few patches I tried.
> 
> I did notice that there are adjustments listed for all the different EG
> functions in the instructions. Could I just skip to those tests or should I
> follow the full guide step by step?
> 
> I have a multimeter and a PC oscilloscope. Ive also made the 56k Ohm jumper
> that is talked about in the calibration instructions.
> 
> Ill make a video of the problem and post it on youtube later tonight or
> tomorrow. 
> 
> Any help would be much appreciated!
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>