[sdiy] NJM-2069 internals. Was: Re: SSM2040

[Bob Weigel]

Right.  The 2044 has the most similar to moog character of the chips I 
think.  The 2069 is hooked up like an OTA based chip as I recall.  It's 
more similar to the Roland filters I think but the NJM unit sounds 
less...I dunno plastic isn't the word I want but there's just a certain 
sonic character in the 3109 and it's ...it's almost like a person with 
multiple personalities or something :-). And there's a different 
variation of it in the newer gear with the 3R05 and it's less blatant 
maybe in it's version of that 'character' but also less ominous sounding 
I think in some respect.  .  3109 like I say gives me the vast kind of 
feel but with this distinct character that presents itself with a kind 
of authority.  Whereas the later ones sound less vast and have a kind of 
'artificial' rub but it's not shrouded maybe with this vastness so that 
it works in certain sounds and sucks on others.  You can hear a song I 
did on the MKS70 using random sounds that were floating on a RAM card I 
built (which had an odd problem and I abandoned the project some time 
back.  It loads single patches all day long.  But if you do a bulk dump 
it starts corrupting data the SAME way every time at the SAME spot every 
time.  Grrr.. Maybe someday someone will offer a useful clue there. ) here

http://www.imt.net/~sounddoctorin/SDstudio/samples.htm

 .It excels at these goofy kinds of sounds, or video game type sounds.  
(Did one that totally reminded me of the level 7 'boss' in the game 
'Descent' :-).  )  The highs sound so good on the MKS70.  But there's 
this ploinky kind of attribute that surfaces on certain types of sounds 
and maybe it's more the oscillators than the filters or maybe not 
because I hear it I think in all the Rolands that use that filter.  
Including the later MKS80 I think with that filter.  It's subtle and 
maybe it's just my personal impression based on my fiddling with them..I 
dunno.  Anyone else?

Anyway the 2069 has some similar attributes to the Rolands I think but 
it just sounds more 'wet' and doesn't make those goofy sounds really as 
much but rather is useful for more very ominous sounds.  The DSS-1 is a 
beefy synth and it's too bad more scsi interfaces weren't made for it.  
Still a great studio machine and Larry Hendry who tragically died a 
couple years ago did some really nice sounds for them and there are 
still pointers to some of his resources at sounddoctorin.com on the 
universal synth link to korg and DSS-1 as always.  -Bob

bayne d'artagnan wrote:

>It occurred to me today that it's unlikely that the NJM2069 is an
>SSM2044 clone. The 2044 is a ladder filter with the transistors  of
>the ladder replaced by the gain cells. As such, the caps span the
>ladder and do not tie to ground. The NJM-2069 ties all of the filter
>caps to ground so it's likely to be similar to almost every other chip
>filter. The question is then, what's the nature of the gain cells?
>
>Thoughts? Corrections?
>
>On Nov 5, 2007 4:39 PM, Nicholas Gregorich <nicksdsu at mac.com> wrote:
>  
>
>>anthony wrote:
>>    
>>
>>>What was the NJM2069 again? I remember seeing an NJM2069 called for in
>>>something I needed, but I forget what...
>>>
>>>      
>>>
>>Korg DSS-1 and friends' filter.
>>
>>Nick.
>>
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