Hmm...I'm not so sure why you need the refer message here. This would only be to dynamically change associations between [coll]s. The argument for [coll] isn't just to load a file, as the help file suggests. It also associates [coll]s, so if two [coll] have the same argument, they will share the same contents and update each other. But I think you'd be okay with static associations, if you even need them. I can't really tell by the video (which is cool, by the way) if this is what you actually mean by another instance of [coll].
I'm not sure why you're having problems just sending an index number. It works fine for me. Maybe the attached patch might clarify some things?
http://www.pdpatchrepo.info/hurleur/randomcollnotes.mmb.pd