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Here's an updated tool to include Loop Start
Remove .mp4 and unzip
Download > Biab Count-In with Loop Start.zip.mp4

Watch: BB-AHK-Count-In & Start Loop.mp4

If you are running Biab As Administrator:
To run script only .ahk install https://www.autohotkey.com/ and set AutoHotKey.exe to Run As Administrator
To run .exe set to Run As Administrator

This uses the system audio for the count-in beeps so if Biab is set to use the same Audio Device, un-check the Always On in Device Driver.