Let me be more concise; hopefully someone knows the answer. Please let me know if you have any ideas.

There are really two separate questions:

1) I am recording voice responses with rt's, and I have the time set as rt:aud,rec,-300, but some of the sound files that are recorded are up to five seconds long, even though I only requested 300 milliseconds of recording. Why might that be happening?

2) Some of the voice response sound files seem to have started recording before the actual voice response occurred, which probably means the reaction times are inaccurate. Is there a reason this might be happening other than microphone sensitivity issues?