When use the portamento for strings like a violin as exemple, I don’t like the behavior of portamento, it doesn’t sound natural and you have to switch to legato mode with the xa control, also the speed of transition between two note is fixed. In comparaison, à Kontakt Stradivari violin offer so much more without changing keybanks. In other hand, with the e osmosis keyboard , you can modulate the speed of transition by the speed of your finger between the two notes, thus I am not sure this function is only a programmation factor or a keybed factor. Could it be way for Yamaha to improve the portamento in montage ?