Doepfer

Hello, 

I’ve tested a make noise math and any waveform above 200/300Hz get transformed to something more “triangular” even with both slew parameters set to 0 (very obvious with a sine). 
I’ve got a A-170 and it’s definitely not the case: what goes in, come out unmodified if the slew is at 0. That’s what I like about it. 
So does the 170-2 have the same behaviour as the maths (modifying the incoming signal)? 
Is it the same type of circuitry that will lead to this behaviour? 

Thanks.