So, there's a note I'm trying to setup a note which slides up to the 16th fret of the G string from an undetermined previous fret, and I was wondering how I might go about authoring this? My first thought was to use an unpitched slide, but I would still require a starting fret for this.

The game has no "slide into" technique, so the best you can do is take a sliding note and link it to the note on G16. Making the first note an unpitched slide from 2 or 3 frets below 16 would probably give the player enough of an idea of what to play, and the game will be very loose on scoring the unpitched slide.

I figured that might be the case. Thanks for the tip!