Well, you would need a voice panel, but those are very expensive, but what should work (for non-life safety purposes mind you) is an MP3 board that some members of the community actually use (mainly because they’re cheap & they work). Here’s a different version of the one that I use (its 20 inputs help ensure that you always have plenty of inputs for plenty of messages. You will however need a pretty beefy power supply to power it with as I’ve discovered (as well as a mini SD card & an adapter for it): FN-BC20 20-Channel Stereo MP3 Sound Board with 2x25W Amp & Enclosure