seems like i have the same problem exactly!!
i had this all the time but i use usb midi keyboard so didnt had to fix this till now
that i want to record my microkorg both midi and audio to have the knobs tweeked , and play live and...
im trying changing the buffers and enable disable the direct monitoring...
and waiting for reply from maudio's support email...
i was also thinking of getting a firewire expansion card... maybe it related...