Budding composer seeking help with recording audio

I’m currently stuck, and I’d need the help of anyone who knows a thing or two about computers and recording audio from your computer into an audio file. For my Rock songs, I use Guitar Pro v5.2 to record the music onto my hard drive in Wave (.wav) format. The software works by taking the audio that passes through the soundcard. Unfortunately, with my new USB speakers, which are not connected to the soundcard’s ports, this doesn’t work anymore, as the configurations used to allow the USB speakers to function rather than the soundcard render the latter unused.

What I’m saying is, I can’t record my Rock songs anymore, which is rather irritating. So, my open question: does anyone either know of a method or a program you can use to record the audio from your computer without using your soundcard or recording devices? I’ve already tried with Audacity, but it only records the audio from recording devices (ie. the soundcard).

Thanks to anyone who answers.