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Question for Korg MS20 owners...
Old 14th June 2010
  #1
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huggie's Avatar
 
🎧 10 years
Question for Korg MS20 owners...

I just recently bought a Korg MS20 in what seems to be very good condition. So far I am absolutely loving what it can do!

However I have noticed something that may or may not be an issue...

It seems to me that there is bleed from the noise generator. With both oscillators on the MS20 turned down and nothing patched... I can hear noise when I play a key. It also can be heard with either oscillator up and the LPF down low. For instance trying to create a sine wav using the tri wave and the LPF... can hear the noise underneath it.

Is this a fault or is it just inherent with this synth in general...

I have included a couple audio files to demonstrate. One is me playing a note with both Osc levels down. The other is me playing a note with Osc 1 up and the LPF knob at about half way.

Hugo
Attached Files

Korg_test1.mp3 (148.0 KB, 1309 views)

Korg_test2.mp3 (128.6 KB, 1088 views)

Old 14th June 2010
  #2
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ctrlshft's Avatar
 
3 Reviews written
🎧 10 years
Just a random thought: Try dead patching both pink and white noise gens. Obv a workaround, not a fix. Could help though maybe?
Old 14th June 2010 | Show parent
  #3
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huggie's Avatar
 
🎧 10 years
Quote:
Originally Posted by ctrlshft ➑️
Just a random thought: Try dead patching both pink and white noise gens. Obv a workaround, not a fix. Could help though maybe?
Thanks for the reply Ctrlshft. Yep tried that... no difference.

Just checking to see if any MS20 owner have the same issue.

I don't want to ship it off to my synth repair guy if it is normal for the MS20 to do this...


Hugo
Old 15th June 2010 | Show parent
  #4
RD9
Registered User
 
🎧 10 years
I tried it on mine and I can hear a very quiet hiss when the sustain at 10 and the volume is set to at least 6+ (both oscillators at 0). When the volume is at 10, the hiss is more noticable, but still quite subtle.

If I set the sustain to 0 and volume at 6, the hiss goes away entirely, but there is still a very faint click/thud if I bring the volume up to 10.

Generally, I wouldn't see this as an issue (at least on my MS20) since any kind of subtle hiss is easily overcome by any tone. Plus, I don't think I would hardly ever bring the volume up to 10.

Maybe your amp/mixer is amplifying the hiss? And what was your volume set at when you recorded the sample with the hiss (Korg_test2.mp3). If it was set to 10, maybe you're being a little too sensitive.
Old 15th June 2010 | Show parent
  #5
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huggie's Avatar
 
🎧 10 years
Quote:
Originally Posted by RD9 ➑️
I tried it on mine and I can hear a very quiet hiss when the sustain at 10 and the volume is set to at least 6+ (both oscillators at 0). When the volume is at 10, the hiss is more noticable, but still quite subtle.

If I set the sustain to 0 and volume at 6, the hiss goes away entirely, but there is still a very faint click/thud if I bring the volume up to 10.

Generally, I wouldn't see this as an issue (at least on my MS20) since any kind of subtle hiss is easily overcome by any tone. Plus, I don't think I would hardly ever bring the volume up to 10.

Maybe your amp/mixer is amplifying the hiss? And what was your volume set at when you recorded the sample with the hiss (Korg_test2.mp3). If it was set to 10, maybe you're being a little too sensitive.

Can you create a sustained sine wave sub without any white noise in it?

Hugo
Old 15th June 2010 | Show parent
  #6
RD9
Registered User
 
🎧 10 years
Quote:
Originally Posted by huggie ➑️
Can you create a sustained sine wave sub without any white noise in it?

Hugo
Yup. I get a clean tone. If you like, post a pic of your knobs and I can match it and post a sample MP3 if that helps.
Old 15th June 2010 | Show parent
  #7
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huggie's Avatar
 
🎧 10 years
Quote:
Originally Posted by RD9 ➑️
Yup. I get a clean tone. If you like, post a pic of your knobs and I can match it and post a sample MP3 if that helps.
Thanks RD9!

Here are the settings I used for 'Korg_test1'

Hugo
Attached Thumbnails
Question for Korg MS20 owners...-img_1283.jpg  
Old 15th June 2010 | Show parent
  #8
RD9
Registered User
 
🎧 10 years
Quote:
Originally Posted by huggie ➑️
Thanks RD9!

Here are the settings I used for 'Korg_test1'

Hugo
MS-20-sine-test-1.mp3

Try this. Hey by the way, is it possible to embed a SoundCloud clip on here? I also uploaded it over there.

MS-20 sine wave test - SoundCloud
Old 15th June 2010 | Show parent
  #9
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huggie's Avatar
 
🎧 10 years
Quote:
Originally Posted by RD9 ➑️
Attachment 178480

Try this. Hey by the way, is it possible to embed a SoundCloud clip on here?

9dr9dr - MS-20 sine wave test - SoundCloud

Great thanks for that! Looks like you can get a cleaner sine wave than me.

The noise bleed is way more noticeable on my Korg.

My synth repair guy should be able to fix it.

Quote:
Originally Posted by RD9 ➑️
Hey by the way, is it possible to embed a SoundCloud clip on here?
I just use the manage attachment option to upload the MP3 files to GS.

Hugo
Old 15th June 2010 | Show parent
  #10
RD9
Registered User
 
🎧 10 years
Quote:
Originally Posted by huggie ➑️
Great thanks for that! Looks like you can get a cleaner sine wave than me.

The noise bleed is way more noticeable on my Korg.

My synth repair guy should be able to fix it.

I just use the manage attachment option to upload the MP3 files to GS.

Hugo
No prob. I hope it's an easy fix. And I hope you make some good stuff with that MS20. They're awesome.
Old 15th June 2010
  #11
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Don Solaris's Avatar
 
4 Reviews written
🎧 10 years
Quote:
Originally Posted by huggie ➑️
However I have noticed something that may or may not be an issue...
Replace all electrolytic capacitors and the problem will gone.
Old 15th June 2010 | Show parent
  #12
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huggie's Avatar
 
🎧 10 years
Quote:
Originally Posted by Don Solaris ➑️
Replace all electrolytic capacitors and the problem will gone.
Thanks Don! I will mentioned that to my synth repair guy.

Seems like you have intimate knowledge of the MS-20...

Hugo
Old 15th June 2010 | Show parent
  #14
Deleted 8456dd3
Guest
Don, can you squeeze a joystick into that, would be cool to have a joystick like on the Synthi to assign to stuff as a performance controller.
Nice wide range on the LFO too i hope super slow to super fast...

Would also be cool if if the ms-30 could be the same depth as the top of the ms20 so it could sit on top nicely... if your selling these people could get wood side panels made up and bolt them together... being the same depth and all...

Joystick would be a nice thing......

So when can i buy one... heh

Old 15th June 2010 | Show parent
  #15
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rasseru's Avatar
 
1 Review written
🎧 10 years
+1 for the interest in the expander
Old 15th June 2010 | Show parent
  #16
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huggie's Avatar
 
🎧 10 years
Quote:
Originally Posted by Don Solaris ➑️
Replace all electrolytic capacitors and the problem will gone.

Will these be the source of the noise bleed?


Hugo
Old 16th June 2010 | Show parent
  #17
Lives for gear
 
🎧 10 years
Quote:
Originally Posted by rasseru ➑️
+1 for the interest in the expander
ill see you +1 and raise another +1
Old 16th June 2010 | Show parent
  #18
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Don Solaris's Avatar
 
4 Reviews written
🎧 10 years
Quote:
Originally Posted by RobJB06 ➑️
Don, can you squeeze a joystick into that
Of course...

















...not! heh

Seriously, the cost would go way too far and i just want a simple expander that every hungry student can afford. Prices of MS-50 are way off the reach for most, which is where i see a chance for MS-30 somewhere in the middle.

I'm not sure just when to find time to actually build this thing. But i'll let you folks know when something comes out. (Best to forget about expander for a while...)
Old 16th June 2010 | Show parent
  #19
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Don Solaris's Avatar
 
4 Reviews written
🎧 10 years
Quote:
Originally Posted by huggie ➑️
Will these be the source of the noise bleed?


Hugo
Most likely. If not, your tech will have to trace it with the scope which is near impossible given the physical design of the unit and boards within. heh
Old 16th June 2010 | Show parent
  #20
RD9
Registered User
 
🎧 10 years
+1 on the expander.
Is there a main page for updates/news on your project?

Oops. I just read post #18. Well, post a link anyway if you decide to set up a page.
Old 16th December 2010 | Show parent
  #21
Lives for gear
 
🎧 15 years
Mine has the same issue as described above--I'm wondering if this is a common trait of the ms-20? or just aged caps? Would a certain amount of white noise when keys are pressed and both vco's are at 0 be considered normal?
Old 16th December 2010 | Show parent
  #22
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giorgio's Avatar
 
🎧 10 years
if I'm not mistaken this is just from a noisy VCA, and not "bleed through". I have heard that there are some upgrades you can do to the MS-20 to change this noise as well as re-capping as others have said. I think the upgrade involves a new chip maybe a better opamp or something. Myself I will most likely keep my MS-20 as is, I've never minded the bit of noise in there.
Old 16th December 2010 | Show parent
  #23
AvS
Lives for gear
 
🎧 10 years
Its pretty normal on old synths. And its usually not noise bleed from the noise generator but from the vca as giorgio said. Noise bleed would go through the filter.
I dont think my MS20 has that much noise but it has some is that fine. I dont use analog synths for cleanness.
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