A few weeks ago I decided that I wanted to have countdown timer in one of my Storyline projects that I was creating for work. Upon searching through the different features of Storyline, I was unable to find a solution straight out of the box. I did a search of the web for solutions to the problem and came upon several different solutions. One solution was to add "X" amount of text boxes that show on the slide for 1 second year. I was wanting to have the timer countdown from 60 seconds. This would mean I would need to create 60 text boxes, and type in 60 numbers. This seemed like way to much work for what I wanted to do. Another solution was to create 60 hidden shapes (off the page) and have a variable count down each time the timeline came across one of the hidden shapes. Once again this would require me to create 60 different shapes and 60 different triggers. Using this as a starting point, I started brainstorming other solutions. The solution I came up with turned out to be pretty simple: use two 1 second audio samples and then create a loop that changes a variable every time the audio clip changes.
I found the 1 second audio clips on this page: http://www.xamuel.com/blank-mp3s/. They have quite a few different time lengths on this page so if you different time frames you should be to find something here.
You can check out the video below to see exactly how I went about creating the countdown timer. You can also download the project file CountdownDemo.story if you want to see how it works.