Thanks for reaching out. Currently, once the Emma for Salesforce integration is connected, any new contacts created in Emma will sync to Salesforce.
By default, those new members will be added to Salesforce as Leads (if they do not already exist in your Salesforce audience), though the integration can be configured to add new Emma members as Contacts in Salesforce.
I hope this information is helpful! If you have a specific use case that you're trying to solve for, please let us know and we'd be happy to assist further!