G'day Mario,
...gliss of 3-4 octaves - in short, you don't. At least not in NWC.
There is a technique that was proposed by Fred Nachbur and an example of which is on the Scripto
http://nwc-scriptorium.org/ftp/helpful/gliss.nwc It works fairly well most of the time but I've had sound cards with which it is not always effective, and it would be very tedious for 4 octaves.
There is quite some discussion on this in
http://my.noteworthysoftware.com/?topic=4953Lawrie
