It's within playback in BIAB, and in the realdrums exported track. Seemingly only the Realdrums, and audio from Chord export #9 joining the fun. In my case a song with a lot of beat count switches between 3/4 and 4/4. Song file is a mainly 3/4, but the intro 4/4.
The Eureka ?? :
Originally Posted By: Bunyip
When I reverted to a standard 2 bar ending the problem disappeared.

Set mine to 4/4, 'bang' is still there BTW.

Re-rendering doesn't solve it, Windows 10, 64 bit, Fall Creators (v1803?) BTW an external USB RME interface, HD audio disabled in Device manager. Anti virus with BIAB folder set to 'trusted'.

Switching off 'audible lead-in' and chord output on ch #9 does fix matters though, see below:

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BIAB count in.jpg (101.14 KB, 82 downloads)