Here's my take on What Real Band Doesn't Do.

In the Real Band wish list (I think) I opened the discussion, "Real Band--the Killer App." From others' comments I extracted three deficiencies which, if corrected, would make RB indispensable to everyone, not just PG fans. They were unlimited channels, full support of VST technology (meaning the ability to handle tempo information), and implementation of Rewire.

I've never used close to 48 channels; I just mention that because other sequencers don't have that limitation. The need for full VST support should be apparent to anyone who uses them.

Rewire may not be so obvious. I've made a specific, detailed request for this in both the BIAB and RB wishlists. Please look up that post for detailed information on why this would be a Good Thing. I'm not actually sure it would be possible in BIAB, but I see it as a sine qua non of any app claiming to be a full-featured sequencer, i.e., Real Band.

In short, it allows any two Rewire-equipped sequencers to work together as one so that you can use the unique features of each. No more copying or dragging/dropping tracks, just use the audio/MIDI output from each as is. From what I've read here I don't believe there are many people who would need more than two programs to overcome any limitations they might see in any one alone.

Selfishly, I want to be able to use BIAB and/or RB with Propellerhead* Reason, a mighty sequencer/soft instrument combo which, oddly, doesn't support MIDI Out. Reason has a few other quirks (including, if I understand correctly, not supporting drag and drop), but combining the strong points of it with PG products would, to me, be unbeatable. But ya gotta have Rewire working first.

*PH and Steinberg [of Cubase and Nuendo fame] were the developers of Rewire.

"My primary musical instrument is the personal computer."