Hi! I'm a music composer, I've never participated in a game jam but I'm interested in a new challenge.
I have no experience in Game Design but maybe the point of view from a pure user standpoint could be useful. Anyway I think it's cool that you want every member to be involved in the overall game rather than just their part, I really vibe with that.
For contact, I mainly use discord for communication so if that's fine with you we could add each other there. I don't use X at all (sorry :/).
And if you have already found your match, I wish you the best!