playback synchronization

I tried to record two stereo tracks using the demo, but the second track,
on which I recorded a piano part while
listening to a drum and bass part on track one, was out of synchronization
when I played them back together. The
second track was advanced in time when
compared to the first track. Question:
is this a problem with the demo? I
don't see how one could record multiple
tracks if the sync is out. Any solution
other than adding a brief silence to
the second track to bring them back
time synchronization? Thanks for the
input.