Isabelle Perrin demonstrates some of the effects used by harpst-composer Bernard Andrés in these videos. If you've found this page first, look for the print version which contains what we hope are all of his special effects in writing on our resources page. There's also a link to the German translation there. There's no need to guess when you've got a good idea of what the composer wanted.
#6 Pincé or Sons Pincés