Archived request from the wiki:

Damper

• Other names: Guitar damper, damper pedal
• Family: Electronic or Other Instruments (depending on which one this turns out to be)
• Description: A type of guitar effect device
• Appears on:
  1. Astro Lounge as electronic instruments (played by Chris Racine)
• Comments:
  • I initially thought this was a type of effects pedal, but I learned it could also mean a plastic device placed under the strings to dampen the sound. It's possible the term could be used for both. – HibiscusKazeneko 10:49, 3 January 2013 (UTC)