[sdiy] Kawai SX210 and SX240 DCO poly.

[Adam Inglis]

Great info, thank you

The specs make it sound quite versatile, but that doesn't seem borne  
out in the demos I've heard online.
Never seen one in the flesh - is the parameter access not much fun?

Adam

On 15/03/2012, at 10:38 AM, KD KD wrote:

> In my ongoing and some what irregular .....skip..... previously my  
> Poly61
> examination, i have now arrived with my smelling horse at the Kawai
> history dump.
>
> SX 210 single ramp DCO (Roland JP8) with subosc (Roland Juno60) and  
> SSM2044
> VCF and 2 quite clever ""logic"" based ADSR's similar principle as  
> Juno6 but 2
> separate ADSR EG's for each voice.
>
> SX240 even more so stylish dual DCO ramp (model JX3P) and sub  
> (Juno60) DCO2 only
> a square wave yet selectable octave, and the same clevery designed  
> ADSR's Same
> SM2044 VCF. The 240 have a osc mode known as BRASS each DCO feeds a
> diode who's anded. 210 has variable 6db HPF and the 240 has a dual  
> 6db HPF.
> Both have master VCA at the rear end to set patch volume.
>
> A interesting issue are the Ensemble unit very similar to Korg  
> poly6, two 3phase
> oscillators mixed into 3 composite each feed to a multivib VCO who in
> turn drives
> a MN3009 BBD multiply this by 3 and your there. Each BBD have  
> compressor and
> expandor. Unfortunately no speed adjustment as per Poly 6 but you  
> could modigy
> and steal for instance the noise VOL CV or better yet take the LFO  
> to VCA CV
> signal for some real wash.
>
> Another peculiar design move are VCA's, for each voice is a
> differential PNP mirror who
> are summed into one differential instrument amplifier (typical 3OP amp
> classic design).
> Clever design since it saves a lot of components.
>
> The SX240 have 12VCA's arranged in 8+4 for dual by 4voice poly by  
> simply
> turning off/on 4 of the VCA's to create the dual 4voice split/layer  
> mode.
>
> Dual 8031, 8253 for the DCO's and a surprisingly high resolution on  
> the synth
> parameters, CV's are created by a discrete 10bit DAC who feeds a  
> temp comp
> expo. 1 prescaler for each DCO and a master LCO clk for bend/vib.
>
> SX210 and 240 have various split-mono-layer modes as it seams.
>
> If kawai had supply these two machines with knobs/sliders in the same
> way as Roland
> did with Juno 60-106 Roland would have faced a serious challenge.  
> Add ensemble
> speed and arpeggio and they would have killed off the Korgs and  
> Rolands.
>
> Thank you for your attention and the opportunity to yet again waste  
> your time!
> Im most delighted! 8-)
>
> Regards
> Kurt Donnegut!
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