Sounds like you’re trying to give a jazz solo a sheet‑music map—fun, but a bit rigid. Start with a rough outline: an ascent, a climax, a descent. Then, instead of locking each section into a fixed segment, treat the curve as a *guide rail*. Let your ideas wander along it, but when they stray too far, gently nudge them back. Think of the function as a wind, and your digital loop is the bird that can glide off the path. Whenever a spontaneous burst hits you, just slide that part of the curve forward or pull it back—no need to rewrite the whole thing. That way the emotional arc stays coherent, yet the narrative still feels alive and unplanned.