Korg Mono/Poly

hi folks,

I seem to have some problem with my Mono/Poly... I discovered last week that, when I hit any key, there is a white noise, even with all OSCs turned off... when the filter is all closed its still there, and also the VCA Envelope does affect the noise - when I turn the release up the noise sustains; So it seems like there is sth. wrong with the VCA or the VCF, no?

Do you have any hint where to look at first? is this probably a problem with the filter  ICs, or some capacitor in the VCA section??
I will record the noise today to demonstrate, if this would help?

best,
mark

Hi Mark

> I will record the noise today to demonstrate, if this would help?
This will help for sure.

Florian

hey florian,

sure, I will record the noise asap.
but do you have already any idea where this could come from? 

thx for your help,
mark



Am 06.11.2011 um 21:07 schrieb Florian Anwander:

> Hi Mark
> 
>> I will record the noise today to demonstrate, if this would help?
> This will help for sure.
> 
> Florian

A recording would help to understand if its just the normal low level noise you find in the circuit or if it is indeed something of concern.
Alan



________________________________
From: Mark Burow <burow@gmx.ch>
To: Florian Anwander <fanwander@mnet-online.de>
Cc: korg_mono-poly@yahoogroups.com
Sent: Sunday, 6 November 2011, 21:20
Subject: Re: [korg_mono-poly] White noise when played, even with all OSC off and filter closed


  
hey florian,

sure, I will record the noise asap.
but do you have already any idea where this could come from? 

thx for your help,
mark

Am 06.11.2011 um 21:07 schrieb Florian Anwander:

> Hi Mark
> 
>> I will record the noise today to demonstrate, if this would help?
> This will help for sure.
> 
> Florian

Hi guys,

I made a recording of the problem-M/P tonite:
I tried to capture the noise by doing the following:

first, all OSC off, and filter Cutoff & resonance set to 0; VCF Env 0, VCA attack 0, dec./sust. mid, short release; No additional noise or any fx;
playing a pattern C3 A2 C3 C3 A2 C3
then I first turn up the 16' sinewave, after that the 8', the 4' and the 2', and then the cutoff a little bit, as well as the VCA release...

hope you can hear the noise / distortion, sounds really strange to me - none of my other synths have anything like this, and as far as I remember the M/P didnt have that earlier (didnt use it for quite a while...)
earlier I used the M/P with 1 sinewave for heavy baass lines, dry stuff, without any noise at all... now I cant get any nice sound of it anymore without that noise... :( 

any idea off what this could possibly be?
how can I track down the fault?

thanks & regards
mark




http://dl.dropbox.com/u/1951882/00.%20MonoPoly_recorded.mp3


Am 07.11.2011 um 11:45 schrieb Alan Dicker:

> 
> A recording would help to understand if its just the normal low level noise you find in the circuit or if it is indeed something of concern.
> Alan
> 
> From: Mark Burow <burow@gmx.ch>
> To: Florian Anwander <fanwander@mnet-online.de>
> Cc: korg_mono-poly@yahoogroups.com
> Sent: Sunday, 6 November 2011, 21:20
> Subject: Re: [korg_mono-poly] White noise when played, even with all OSC off and filter closed
> 
> 
> hey florian,
> 
> sure, I will record the noise asap.
> but do you have already any idea where this could come from? 
> 
> thx for your help,
> mark
> 
> Am 06.11.2011 um 21:07 schrieb Florian Anwander:
> 
>> Hi Mark
>> 
>>> I will record the noise today to demonstrate, if this would help?
>> This will help for sure.
>> 
>> Florian
> 
> 
> 
> 
>

Hello Mark,

I did not compare it to my M/P now, but I tend to say: this is normal 
noise caused by the circuitry (typically from the resistors). Could it 
be, that you made some other change (better speakers, different audio 
connection) which makes you hear things now, you did not hear before?

Florian

Mark Burow wrote:
> http://dl.dropbox.com/u/1951882/00.%20MonoPoly_recorded.mp3

I have the same noise but yours does sound much louder in level.  Maybe a full recalibration would help starting from the power supply.
I assume the sine wave you were producing with the filter in self resonance and that there was no compressor on the recording right?



________________________________
From: Mark Burow <burow@gmx.ch>
To: korg_mono-poly@yahoogroups.com
Sent: Wednesday, 9 November 2011, 9:47
Subject: Re: [korg_mono-poly] White noise when played, even with all OSC off and filter closed


  
Hi Florian,

well, no, I didnt really change anything important. same speakers, same interface, same room;
I do remember that I created some really fat bass lines with the M/P earlier, without any noise/high frequency stuff alongside... maybe you're right, and this is just normal noise; but if you (and anybody else here who has the time) could please just check shortly if you also have this audible noise when all OSCs are turned to 0 and filter is fully closed; It would make me sleep better knowing that my M/P is still full functional, and not some sort of whistling box :(

thanks for your help,
mark 


2011/11/9 Florian Anwander <fanwander@mnet-online.de>

Hello Mark,

>
>I did not compare it to my M/P now, but I tend to say: this is normal
>noise caused by the circuitry (typically from the resistors). Could it
>be, that you made some other change (better speakers, different audio
>connection) which makes you hear things now, you did not hear before?
>
>Florian
>
>Mark Burow wrote:
>> http://dl.dropbox.com/u/1951882/00.%20MonoPoly_recorded.mp3
>
>
>
>------------------------------------
>
>Yahoo! Groups Links
>
>
>
>

Hello Mark

Am 09.11.2011 11:21, schrieb Mark Burow:
> what exactly do you mean with recalibration? do I have to trim/tune the
> voices, or is there some more options to do besides that?

I don't think that any recalibration is required.

regarding sound examples:
I won't be able to do recordings in the same way like you did until next 
week. But I will do.

Florian

Hi Jeppe,

thanks for the info, really seems like this is normal and nothing is broken;

still dont get it how I did these thick fat basslines with one sinewave, filter almost completely closed... maybe I should do some experiments with a LP filter...

thanks for trying!
mark

 

--- In korg_mono-poly@yahoogroups.com, Jeppe Madsen <joppemadsen@...> wrote:

>
> Hey Mark. Mine sounds almost the same at the triangle wave setting. Maybe
> with a little less bg noise, but almost the same. It seems like the
> triangle wave output is quite low, and as a result there's a lot of
> "circuitry noise" on a solo triangle wave setting.
> If you find a way to remove the noise please let me know.
> 
> Maybe you could record the bass line you wold like without any osc's turned
> up, and then re-record it again with the sound you want and then phase
> invert the first recording. Maybe you could cancel out some of the noise. I
> don't know if it would work, or if it's the solution you are looking for.
> 
> Good Luck.
> Jeppe
>

okay, sounds good... whenever you have the time, I'll be glad to hear any examples;

and thanks for your help!
mark


--- In korg_mono-poly@yahoogroups.com, Florian Anwander <fanwander@...> wrote:

>
> Hello Mark
> 
> Am 09.11.2011 11:21, schrieb Mark Burow:
> > what exactly do you mean with recalibration? do I have to trim/tune the
> > voices, or is there some more options to do besides that?
> 
> I don't think that any recalibration is required.
> 
> regarding sound examples:
> I won't be able to do recordings in the same way like you did until next 
> week. But I will do.
> 
> Florian
>