Modern harp effects? If you’re referring to the stuff that Salzedo wrote, it was written mostly in the 1920’s, which makes it almost 90 years old! Salzedo is now as ‘modern’ as Hindemith, Ravel, and Debussy. The ‘effects’ that he created are really just 15 ways to play a glissando. A simple written explanation should suffice whenever a non-standard written symbol is used in music. Is it realistic to expect anyone who plays this stuff 100 years from now to buy a video tape from Lyon & Healy to figure out what the symbols mean?