soundboard

sound +‎ board

soundboard (plural soundboards)

1. (music) A wide, flat board placed within, or forming part of the body of, a musical instrument in order to improve vibrations and increase volume.
2. (audio engineering) A mixing console used to combine and blend different audio sources to a single output.
3. (figurative) A sounding board.
   • 2008 February 3, Molly Reid, “Sean Yseult and Chris Lee”, in New York Times‎:

     Then, as now, they spent their days walking around the city they love, frequenting favorite restaurants or cooking meals at home, and serving as each other’s creative soundboard.

4. (Internet) A control panel offering playback of various sound effects.
   • 2007, starmuscle@gmail.com, “Celebrity Soundboards”, in alt.gossip.celebrities (Usenet):

     Check out these celebrity soundboards and play prank phone calls on your friends, family, and co workers...