Multi-track Audio is now Single Track after Export
When you export a video that has multi-track audio, TimeBolt will merge all of the audio tracks into a single track and attach it to the exported video.
If you want to maintain multiple audio tracks for further project work, you can export the project from TimeBolt as XML or JSON and take it to either Davinci Resolve, Premiere Pro or Final Cut Pro X.
See documentation for more information.