Hi
You can set this to happen with the "Node entry reminder" pref in preferences. When that is enabled, and you're in the roast analyzer, you'll get a "ding" sound and reminder at the specified interval based on the start of the roast. e.g. if it's set at 30 seconds, you'll get reminders at 00:30, 01:00, 1:30, 2:00 etc.
These alerts function a little differently than alarms. Alarms will fire regardless of where you are in Roastmaster, even if it's not currently active. Node alerts, though, only happen when you're viewing the roast in the roast analyzer.