A Quick way I'd do it is to Open the wav(s) in RB.
Highlight the count-in section (what you want to get rid of).

Click Cut .. then make sure the 'Close Gap' check box is enabled.
This removes the highlighted section and moves the track back in time.

If you have multiple wav files, import them all into RB, highlight the section and Cut them all at once.

Then Export the Track(s) as Wav to save them as shorter wav files without what you cut (removed).
May want to backup the originals first just in case you make a bad edit. At least until you get the hang of it.
First image shows highlighted section and Close Gap enabled.
Second image shows track 15 moved back as far as whatever I cut.

Those From-Thru settings can really help, as can the Audio Edit screen (use the +/- keys to zoom in/out)

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Cut-CloseGap.jpg (77.51 KB, 106 downloads)
Cut-CloseGapResult.jpg (94.23 KB, 106 downloads)
ExportAllToFiles.jpg (77.08 KB, 105 downloads)
Last edited by rharv; 02/05/17 12:03 PM.

I do not work here, but the benefits are still awesome
Make your sound your own!