I decided I deserved a break and had a quick look.
Set to single player (left of 4 icons to the left of the master volume slider).
Load a track
At the far left of the waveform window if you go just outside the window (down), you see CUE/LOOP button. Below it is a button GRID.
Click the GRID button.
You should now get all the available tools to modify the beatgrid.
The upright white/red stripe in between the left and right arrows in the middle let’s you set a new downbeat. So if your tracks starts on the second beat because the first one is silent, just set the marker at/around the second beat and click the white/read stripe. This should now be your first downbeat.
You can add a cue point to get to the first downbeat easily.
If we are not talking big numbers, you could open a track in Audacity (free) and just trip it down by stripping the silent bit.
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