The first two bars of your wav are dummy or space makers in place for the count-in. The third bar is the first bar where your audio material is identified or labeled for use by BIAB or RealBand. The chordsheet of the SGU file of the same name as your waveform is read by BIAB or RealBand to gather timing and chord information.

If your waveform extends beyond the last bar of the usertrack SGU file then BIAB and RealBand have no way of knowing the audio exists. I don't know, but suspect the audio will be abruptly cut off when the last bar of the usertrack SGU is finished.

Jim Fogle - 2025 BiaB (Build 1128) RB (Build 5) - Ultra+ PAK
DAWs: Cakewalk Sonar - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home