MS-20 filter response

[tomg]

> I'm simulating the MS-20 with EWB and when I get to the high resonance
> settings (square wave input) I get the normal decaying sinusoid (ringing)
only
> on on the positive going edge. Negative side looks like Q has little or
no
> effect. I'm using an LM13700 model in place of the LM13600.
>  
> 1) Can anyone confirm/deny that this is how the real circuit behaves?

Nope you get a symmetrical sine with the real deal.
 
> 2) Any experience with the LM13600 vs the LM13700 ???

No problem used as a filter. As a vco the 700 won't scale. 

> The one-sided resonance looks cool, I think it probably sounds good too.

Not really it sounds very harsh.

-tg