Legalt

We are using Express Scribe Pro version 6.1. The foot pedal that we are using with Express Scribe is AltoEdge USB Transcription Foot Pedal purchased from NCH website. The pedal will not work with a .mp4 nor with a .mp3 file. The software is Licensed and we checked under About. We went through the Controller Setup Guide. I replaced the pedal with another pedal that was in original packaging and never open. Each time we rebooted the desktop. Any help would be appreciated. thank you.