soundboard

plural soundboards

1. entertainmentA wide, flat board placed within, or forming part of the body of, a musical instrument in order to improve vibrations and increase volume.

   To many a row of pipes the soundboard breathes.

   1667, John Milton, Paradise Lost

2. audioA mixing console used to combine and blend different audio sources to a single output.
3. figurativelyA sounding board.

   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.

   2008 February 3, Molly Reid, “Sean Yseult and Chris Lee”, in New York Times

4. InternetA control panel offering playback of various sound effects.

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

   2007, starmuscle@gmail.com, “Celebrity Soundboards”, in alt.gossip.celebrities (Usenet)