There is absolutey NO reason to use either MME, (or WDM) or WASAPI over ASIO....especially with a pro level audio interface like the FSM. Here's an article that may help you understand the difference between them:
http://promos.chooch.us/archives/479That being said we can help you better now and in the future with a bit more info......if you will post your system specs in your signature, (see my sig), we will be better able to troubleshoot your problems. Without knowing what type of pc you're running, what OS you're using, what DAW etc....we often can't recommend a "simple fix"
If you have not already done so please READ THE MANUAL!