Dan is correct, the Melodist is producing MIDI and is not related to RealTracks. BIAB does have the ability to edit the whole MIDI track for note length, if that's the question. Maybe even adding some reverb to that track will help. The patch (instrument) is critical; a guitar will fade quickly. And we need to know what is playing your MIDI, since MIDI has no sound at all - it's just instructions.

Dan is also correct that the notation for RealTracks is of differing accuracy (I did a few of these) but that is not relevant to the Melodist.

Once we get the basic concepts down, then we can hone in on the solutions needed.

And Dan is particularly right about learning the program. I learn something new every day after using it for 25 years.

So let's try again. Tell us exactly what you did, what it did, and why that's different from what you expected. Also tell us what your Preferences, MIDI driver, Output is set to.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.