Track Synchronization Issue

I'm running X2 on a Windows 8 pc (Core i5, 8GB RAM) and using a Tascam US122L external USB audio interface for input and monitoring.  When I record my second track and then listen back, the two tracks are not quite in sync.  There is a slight delay in the second track.  I have set the latency setting on the Tascam to "lowest".
 
I also tried to drag the second track to try and sync it, but of course when you move it, it moves in increments aligned to the BPM.
 
I'm a newbie, so this is probably something common/easy. 
 
Thanks in advance for any suggestions!

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