With Z3TA+2 the portamento would be the choice. You can directly access portamento duration, and you can really glide from one note to another - if the note durations are smaller than the portamento duration, you can get sounds that seem to be arbitrary, almost like speech heard from a neighboring room through a cardboard "wall" with all the consonants being completely cut off (depending on the waveform you choose). And of course, the portamento duration can be automatized from very short to quite long. Nice toy. Play around with it to get the impression.