Arduino push button audio & led Project

I want to make as small as possible Arduino push button audio & led Project. The logic would be that a user a on/off switch and the Arduino waits for the user to press any of up to 24 buttons. When a button is pressed a led light lights up for 2 seconds while an up to 5 seconds audio clip is running. Pressing any of the buttons will be ignored during this period. The audio files are unique and have a corresponding button. Ultimately if the project works I want to put it on a project board.