I have asked a Zeta and a DZ on this board who go to MTSU to repond here...I hope that they will.
In the meantime, there is this:
http://www.mtsu.edu/~panhelle/
and this:
http://www.mtsu.edu/~greeks/
and links to each chapter here:
http://www.mtsu.edu/~greeks/pan.html
You should also phone the Greek Life Office at (615) 898~5996 and ask them which sororities will be participating in COB (Continuous Open Bidding...i.e. "informal rush")
Questions concerning membership may be addressed to the Director of Greek Life, Keathley University Center Room 310, (615) 898-5996.....perhaps a personal visit to that office might be a good idea?