Receiving and manipulating RAW audio files in MAX/MSP

Hi,

I'm receiving a RAW audio file from an Arduino via serial, and I would like to add an effect to it before sending it back ( in raw format ) to the Arduino.

Adding an effect is not a problem as long as I go through a buffer object.
Unfortunately, the buffer objects does not accept any .raw file!

Does somebody have an idea how I could fix this problem ?

Thanks,

Thomas