There are many factors to consider when exporting a finished song, such as computer processor, amount of memory and the quality level desired. Then matching those up to each and every option given for the export, the more processor power and memory the computer has the smoother the process will be and the more options can be chosen at higher levels, but will increase the time it takes to export the song. There will be no fast easy rule for exporting, but to take the best guess and try it. If it does not come out sounding the way it was intended, then delete the finished export, change the settings and try again. The export does not alter or damage the original .mmpz file, it is only reading as in the case of say ripping from a CD to computer. So keep adjusting the settings until it comes out the way it was intended to sound during the creation. The good news is that it will only take a few trial and error exports to figure out what any particular computer build can handle. Not taking the time on the export and winging it is like missing a note in a song or when playing an instrument, it just does not sound right. The same holds true for the export, take the time here and the outcome will be what it needs to be, as it sounded during playback, but better.