Larry,

You can easily change the instrument playing on any track at any time by accessing the Bar Settings Screen. You access the Bar Settings screen by pressing the F5 key while your cursor is at the bar where you want the change to first happen. Note the name of the new instrument will not show up as a patch on the mixer.

In the screenshot below I've opened the Bar Settings screen, clicked on the RealTracks button and am getting ready to open the RealTracks Picker screen to insert a RealTracks onto the Guitar track at bar 6.

Think of each track as a musician. You may see one musician play both fiddle and mandolin but you will not the musician play mandolin and fiddle at the same time. Same in Band-in-a-Box. Each track can play multiple instruments but each track can play only one instrument at a time.

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Jim Fogle - 2024 BiaB (1111) RB (5) Ultra+ PAK
DAWs: Cakewalk by BandLab (CbB) - 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