Sound Switcher Indicator shows an icon in the indicator area or the
system tray (whatever is available in your desktop environment).
The icon's menu allows you to switch the current sound input and
output with a single click.
The appearance of the menu can be customised. For example, devices
and ports can be given custom display names, hidden etc.
The packages for RHEL 8 and RHEL 7 are in each distribution’s respective Extra Packages for Enterprise Linux (EPEL) repository. The instructions for adding this repository diverge slightly between RHEL 8 and RHEL 7, which is why they’re listed separately below.
The EPEL repository can be added to RHEL 8 with the following command: