(First I have not the 2014 version.)

From what I understand a UserTrack can only be a real track. I would hope that there would be this option also for Midi. Is there any reason that you decided that it shoud be only audio?

I can see several reasons to make this also for midi.
* Change the sound to suite your needs
* Being able to alter a track that suits you to a certain extent but isn't there yet.
* Make several version (modifications) from a track you like such as voice leading, thinning out/make it denser at places etc.
* Control over velocity.

I for instance cannot play keyboard well. Still I want to have more piano parts (well drum and bass to) that are in styles I like. I don't think I easily will get them since the jazz that is dominating in Biab is more "traditional" then what I listen to and compose - though I like the new Jazz poll winners inclution.

For now for several reasons Biab is more a useful tool to exercise improvisation over chord changes more than a tool to work with composing music for me. Well it can sometimes be a starting partner. Part of that is that there isn't enough material that is in my domain. You get very particular when you leave the standards in any music field I think. So a way to include more of yourself and have more control over that would be great if Biab should be a greater partner in composing music - for me at least.

Hope I made sense!?