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Does anyone have any thoughts on this? Am I likely to be able to get the midi melody directly into BIAB with the Triple Play?
Yes BiaB will record MIDI regardless of what kind of MIDI controller is used.
Does the BIAB quantize feature work well?
I do not record in BiaB but I would suspect the quantize should work well.
What sorts of articulations can BIAB record into the midi melody or solo track and play back and why?
It should and probably will record every articulation that the Triple Play can send like pitch bends, vibrato, etc
What sorts of instruments will sound real with the "sforzando SFZ Synth" or "Coyote ForteDXi" (assuming the person is purposely not adjusting the timing of the printed melody which I normally do in jazz before the solos start - I only monkey with the melody timing after the solos).
The Triple Play comes with a number of included sounds that may sound better then either the SFZ or Coyote. I have found that woodwinds, brass, and guitars do not sound real in these inexpensive sound sources. You can help them by learning what articulations the instrument has and what MIDI controller will work that emulation but the better sound sources have those articulations already available, i.e. things like growl for sax and horns, staccato, real legato, etc.
Note that I don't have the Triple Play, I have an old Casio MG510 MIDI guitar controller and that I do all of my recording in my DAW, Studio One Pro 5. You will have more options when recording in a DAW; things like recording on multiple tracks and cutting and pasting, punch in and punch out recording, the ability to record many different instruments on different tracks, etc.
I hope this helps a little.