Sound Control makes network connections for several reasons.
1. Contacts staticz.com and/or staticz.net to check for news and software updates.
Turn off Sound Control's preferences -> About -> Check for update automatically and Sound Control preferences -> Support -> Automatically fetch News to disable these network connections.
2. Everything else. Sound Control contacts websites that are open in Safari to get the websites favicon to help you identify the sites in the menu.
Turn off Sound Controls' preferences -> General -> Show separate Safari sites to disable these network connections.