Korg Mono/Poly

Hi,

My name is Nick, from Australia and I have owned a Mono/Poly for about
one week! Up until yesterday, it worked 100% but I fear it's dying now...

Triangles now sound distored, unless the resonance is up full, then
they sound normal! And in poly mode, chords sound badly distorted
unless res is up full... 

I don't think there's anything I can do for it, but anyway, I look
forward to learning as much as I can from you guys.

Cheers,

Nick.

Hi

The higher the Resonance the lower the level of the signal. This 
explains why the distortion is gone. May be you simply switched the 
output level to "high" (aside the Master volume), and now your following 
audiostage (mixer, computer, whatever...) is distorting.

Florian

nickeax wrote:

> Hi,
> 
> My name is Nick, from Australia and I have owned a Mono/Poly for about
> one week! Up until yesterday, it worked 100% but I fear it's dying now...
> 
> Triangles now sound distored, unless the resonance is up full, then
> they sound normal! And in poly mode, chords sound badly distorted
> unless res is up full... 
> 
> I don't think there's anything I can do for it, but anyway, I look
> forward to learning as much as I can from you guys.
>

Hi Florian, Thanks for the reply! I don t think that s it, as there is no change in this even with headphones directly plugged into the Korg. I have also

Hi Alan, It s not that either, but thanks for the suggestion mate. Nick.

And is it only tri waves that are sounding bad?

--- On Sat, 17/5/08, Nick Fletcher wrote:

It s not as noticeable on the saw and pulses, but they re being affected too. It s odd, everything was working fine when I first got it home. :-(

Hi Nick

> The 'distortion' is not like an overdriven circuit sound, it's a lot 
> more bubbly. Almost like a high speed LFO is garbling up the signal.
Can you put a sound example to the file-section of the yahoogroup?
http://launch.groups.yahoo.com/group/korg_mono-poly/files/

Florian

Thanks a lot for all the help so far guys! I ll get a file up there tomorrow (+10hrs here). Cheers, Nick.

I ve made some recordings of the offender: OSC1 triangle, beginning with it s level all the way down and gradually increasing: 

Hello Nick,

I am sorry to tell you this, but this does not sound good. To me it 
sounds like a broken filter chip. Appearently the filter dose nto work 
as it sould do: The example
> Polyphonic mode,  triangles with resonance fully up:
> http://www.guitaraustralia.com/MonoPoly/trianglePOLY_resUp.mp3 206KB
shows no resonance at all, but feeds through some portion of the input 
signal to the output.

Does the filter basically work? What happens if you turn the cutoff 
frequency potentiometer full counter clockwise?

You might check, whether the SSM 2044 on the filter board is socketed 
and perhaps the chips got loose in the socket and needs to be reseated. 
If the chip is soldered direct to the pcb I think it is broken at all.

Florian

Does the filter basically work? What happens if you turn the cutoff frequency potentiometer full counter clockwise? - Florian Yes, it does work, but seems to

Luckely the SSM 2044 can still be got quite cheap. http://cgi.ebay.co.uk/SSM-2044-4-POLE-VCF-REMOVED-ORIGINAL_W0QQitemZ120261021597QQihZ002QQcategoryZ38071QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

count your self lucky you don't need a filter chip for a Prohpet 5 SSM 2040 £65 each. ouch http://cgi.ebay.co.uk/SSM2040-SSM-2040-VCF-CHIP-FOR-Rev2-PROPHET-5-NOS-RARE_W0QQitemZ170218509386QQihZ007QQcategoryZ38071QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

--- On Sun, 18/5/08, Nick Fletcher wrote:

The chip is firmly in it s bracket, so I guess it just died with the excitement of being used again after 14 years. :-) I owe you guys a lot, because I was