I find that if THEY are interested in your stuff, THEY will contact you with in a few days. If I never get a response, I will wait a year and re-submit. I only send them a link to my tunes as a demo. I would never send certain cues only to a certain library. Cues stuck in limbo, or on a shelf, can’t make you any money! It’s first come, first served. If there are certain tunes they like, that have already been placed by then, tell them you can write something new, that sounds like it!