There's been lots of discussion over the years on whether you want melodies/lyrics first or the instrumentation. From what I've seen, people do it both ways. I tend to be more of a music/instrumentation first guy because it's easier to generate a melody off the chord progression you may already have in BIAB/Realband.
As you know, Billy, I'm just getting into Synth V too and I'm working a track now that has most of the music bed set up. Synth V does look like it has a record feature. What I may do as I'm setting up my melody is to sing into a mic right into Synth V. That should capture the rhythm/annunciations of my voice I want in the melody.
Before I do any of this however, I need to visit ChatGPT and other lyric bots and get those lyrics down and finalized.
