It has come to our careless attention that our recent shift from MP3s to Windows Media audio files for our sound clips has caused problems for Mac users. We will try to correct a software issue on our end to get back to a universal sound format, but for now, here’s a link to a free download from Microsoft of the Mac version of Windows Media Player. If you don’t have Mac OS X, try this link instead. Again, we apologize for any compatibility problems.