This is where you can select the folder for your plug-ins. You can choose what MacMod Pro does at startup. If you run MacMod Pro by opening a song, it will do nothing but open that song upon startup.
You can also select how many levels of undo to use. The more levels you choose, the more memory it requires. You can set MacMod Pro to automatically save the current song every so often. There are also controls for turning the help bar (the text line under the buttons on the toolbar) and playback following on or off. When MacMod Pro is set to follow playback, any open editors (staff editor, pattern editors) will follow the playback by selecting the positions being played.
You can choose to turn off various alerts in MacMod Pro as well as different features including dynamic scrolling and button clicks.
