Doepfer

> hallo group,
>
> does anyone have an elegant way of reproducing the legato-enables- 
> slide behaviour of most synths that i know?

The only simple way to achieve this is having it as a feature of your  
controller. So if by chance you are using a CV keyboard then it needs  
to be available as a feature on the keyboard

Unfortunately if you use the A-190 module with MIDI you do not have  
that feature. The A-190 has portamento, but it's controlled via MIDI  
CC#5 not by playing technique. The higher the value the more  
portamento, 0 is no portamento, the default. The Kenton Pro-Solo on  
the other hand is an interface I know to have the legato playing =  
portamento feature. A few other interfaces might have it too. You  
would just set a legato portamento time and then you get that when  
you play legato.

As for doing it in modules. I think it's possible with the A-171 to  
use the presence of a gate to increase portamento from zero  to a  
value you want. Then with no gate present to instantly change pitch.  
But I think there will be a problem that it will add slew too quickly  
so it would be slewing whenever you play any note. Maybe one could  
use another slew with rise time only , it need not be VC,  to work as  
a sort of gate delay and then a comparator to generate the actual  
gate for the VC portamento.  So when no gate is there you have  
instant pitch change. When a gate arrives the second slew is set to  
rise only and generates a new gate that is slightly delayed via the  
comparator. That new processed gate is used to turn up the slew time  
for any pitch changes when the gate is still active. When the key is  
released the second slew has an instant fall rate, the comparator  
quickly turns off the gate and the slew to the pitch is no longer  
active and it's instant pitch change until it ramps up again.