BZSoundboard lets you create virtual soundboards on your Mac. Soundboards are two-dimensional arrays of buttons, each of which plays a sound. You must first drag files onto the Soundboard window, and then you can place as many files as you have cells (buttons).
In addition, you can create more cells by resizing the window, and you can change the size of all the cells by holding down option and resizing the window. Afterwards, you may click on a cell to play its sound clip.