Hello,
Please be aware that only an AltoEdge pedal works with the free version of Express Scribe, any other pedal requires that you have a license registered. To register your license, open the program, at the top left corner of the program, from the drop down menus, go to "File > Register Software...", enter your registration code (numbers-letters) and click "Register".
To setup your foot pedal:
1- Connect the Pedal to an available USB port of the computer, do not use a USB hub as it might cause it not to receive enough power.
2- Open Express Scribe, go to Options > Control.
3- Check the "Enable foot pedal controller" box, then click on the button "Controller setup wizard...".
4- Click "Next", on the "Plug and Play" tab, the foot pedal should be listed, highlight it and click "Next", click "Next" again on the "Controller Properties".
5- On the "Controller Command Map Test", press the different pedals and confirm the word "Yes" under the "Pressed" column while it is being pressed.
6- Click on "Finish", click "OK".
If you keep having issues, enter a support ticket at http://www.nch.com.au/support/index.html