soundboard

noun4

1. •
   A 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
2. •
   (Internet) A 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
3. •
   A mixing console used to combine and blend different audio sources to a single output.
4. •
   (figurative) A 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