[LAU] recorded using arecord, plaback seems a bit fast

Hello, I used the following command to record audio from a live performance using the M2496 [M Audio Audiophile 24/96] card on a machine running Ubuntu Feisty: $> arecord -D plug:hw:1 --duration=600 --file-type au --format=dat --nonblock recording-arecord.au Then I transfered the au file to my home computer and opened it in audacity. When I playback the file, it appears to be being played back at a slightly faster rate. I also tried to encode the original au file to a flac file first, before transfering the file, using this command: $> flac -f --endian=big --channels=2 --sample-rate=48000 --bps=16 --sign=signed recording-arecord.au Then I imported that flac file in to audacity on my home computer. It plays back the same as as the original au file -- seems a tiny bit faster. What could be the problem? thanks, ->HS