[LAU] foot switch for pausing/playing audio signals for better transcribing

Hello list, The situation is that I often transcribe audio signals (music of course, but also spoken words like interviews) to my computer. Its a good situation when your hands are free so you can use both hands to write. I recently read about some expensive usb-footcontroller (USB) which somehow connects to an audio program to send start/stop signals. This cant be this complicated... there a plenty of midi controllers out there which you controll with your food, even the sustain-pedal is suitable for the start/stop job. Do you have any Idea or know of anything which do the described? Just sending a signal to a audioprogramm (audacious, audacity, xmms etc.) to halt? greetings, Nils