VST3 Plug-ins is a work-in-progress new feature for Band-in-a-Box 2025. As Vincente stated you need to update to +++ BiaB build 1125e +++ since most of the the updates are to get VST3 plug-ins working correctly.

To choose SampleTank4 as the default synth use the mixer and press the <eye> icon. Then enable the "Default Synth Track" so it will be a visible track. Finally, right click on the Default Synth Track and choose vst3 synth. Currently a vst3 isn’t selectable from the options - midi driver dialog, so you must use the mixer.

When you select a vst3 to be used as default synth, the name of the synth won’t be displayed on the mixer. Instead the mixer will display something generic like “vst3 Selected”.


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