The Icon options allow you to have a visual indicator of when you receive an alert. You can configure Toggler to flash the icon in the Windows Notification Area (by the clock) when certain keys are pressed or toggled. You can change both the number of times it will flash, and the delay between flashes. Experiment to see what you like best!

The flashing icon option is a good alternative if you don't want sounds alerting you to a keyboard event.