Sometimes you want to keep the SalesScreen browser window open, but mute the sound that plays when a notification comes in. This is how you do it.
1. Open the notification window by clicking the bell icon in the upper right corner
2. The notification window has a small speaker icon at the top. If you click it, you can toggle between two different states:
a) Green: A short bop sound will play when notifications are received
b) Red: Notifications will appear without any sound playing.