Yes, I know how to create a glissando effect with <tt>[mpc:pitch]</tt>.
Now I would like to make it visually like on one of this image (from wikipedia (https://en.wikipedia.org/wiki/Glissando#Notation)) :
(https://upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Glissando.JPG/1192px-Glissando.JPG)
Is there a way to do it (ideally the wavy one) with NWC?
Try Mike Shawaluk's Glissando user object:
https://forum.noteworthycomposer.com/?topic=9176.0
Thank you
@Lawrie for the plug. The user object will also perform playback, if you follow the instructions in the help docs.