The Thru track is what allows you to play along with BIAB in real time with specific track settings not dependent upon any other track settings (patch, VSTi, pan, volumes, et). When you connect your keyboard or other MIDI device to your computer, what you hear is based on how the Thru track is configured.

If you want to capture your performance, BIAB lets you record it to either the Melody or the Soloist track (essentially capturing what is coming through the Thru track and redirecting that MIDI data to either the Melody or Soloist track).

If you configure the Thru track with a specific VST and maybe added effects, that's what you'll hear when you record. What gets recorded, though is the MIDI data associated with what you played. You would need to configure the track you recorded to the same way as the Thru track to reproduce the performance.

That being said, there is a tie-in (and I'm not at my home computer, so I can't explain it properly), but if you already have a melody recorded and then you use the Thru track to record a soloist track, you won't hear the melody track while recorded the soloist track (or it might be the other way around, where if you have the soloist track recorded, you won't hear it while recording the melody - but I hope you get my point).

Of course, once you play back the recording, you'll hear both melody and soloist. What you hear on playback, however, depends on how you configured the melody and soloist track. Settings on the thru track do not carry through to those tracks when recording. (I wish there were an option to allow that to happen, as that would make recording much easier).

Again, the reason there is nothing recorded to the Thru track, is because it is the track that allows you to PLAY along with a MIDI instrument. The Record button is what captures that information to one of the other tracks.

I'm not sure how else to explain it.

John

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