Dave Smith Instruments SYNTHESIZERS

Hello all
New to the evolver and the group.  I've fiddled with the synth a bit and already have a 
question.  I have found that a second note often won't trigger if played too quickly 
after the first note.  Fast playing is impossible.  I've adjusted the trigger parameter 
and the glide, etc. without much success.  I was able to get the classic portamento 
sound only if the second note was below the first one triggered, then if I changed the 
trigger params it would work with higher notes only.  What am I missing?  I just want 
it to play like a monosynth.  Thanks in advance for any help.
Stuart Currie