New Smyrna Beach, along with all cities in Volusia County, is on the county's EDACS 800 MHz trunk system. thus you will need a scanner that will work with EDACS trunking.
Frequencies & talkgroups for Volusia and its cities are in the database of this radioreference.com website.
You can hear Fire dispatch for New Smyrna, Edgewater, Port Orange, Ponce Inlet and South Daytona on 155.115 out of Ponce Inlet or 154.010 out of New Smyrna/Edgewater. These are just simulcast of the 800 system so that the station pagers can be toned out.