I’m sorry not to be able to answer your specific question, but I just saw a student-produced show at Wesleyan, and the score was written and performed by students. It was really impressive. My sense from my Wes kid (artsy but not an instrumentalist) is that there are lots of opportunities for musicians on campus.
Also, these pages have more information, including contact info for the music director, in case you want to reach out:
https://www.wesleyan.edu/music/ensembles/orchestra.html
https://orchestra.site.wesleyan.edu/
Good luck!