Thank you for the detailed comments, I really appreciate it.
FREQ is really just the base velocity. So twisting it just makes the curve go up and down.
The original ideas I had (still related) definitely was less complicated, but I felt that it wouldn't match the theme too much, and so I kind of stumbled my way onto this synthesizer thing.
For the jump controls, maybe I should have had a super long jump level to really show how the curve affects you jump. I do wish it was more accessible, and I wish it wasn't as difficult. But such is the nature of game jams; no time to get feedback. Just gotta bank on the levels you made and nothing else to say other than "i'll do better next time."