Dave Smith Instruments SYNTHESIZERS

Hi, I was using my evolver with my midi keyboard. I started looking 
the sounds on bank 2 (the ones meant for keyboard playing) and I cant 
make the evolver react when a second note is pressed while a first 
one is still on. I cant make it glide. It will ignore all notes until 
I let it go any previous notes. 

I've tried different settings (trigger select, keymode, etc...) but I 
cant find a way to make the typical 'mono lead' that glides as notes 
are played. My evolver just ignores any second notes if a key is 
previously pressed, so I cant make any lead sounds. 

Can anyone help?

Thanks