Setting the appropriate buffer in Live vs. Max

I'm building a live sampler to use through Maxforlive. Sometimes I'm experiencing annoying clicks when fading in and out of the sound files. I figured that this could be due to a too low buffer. But the clicks doesn't seem to improve when I adjust the buffer in Live. Is Maxforlive using Live's audio processor, or should I adjust another buffer somewhere, in Max?

Thanks in advance!