This is an internet phenomenom that went viral and it all started here according to this website.
The audio file signal was played and processed in SDRSharp and outputted through a virtual audio cable.
Then the audio was received from the virtual audio cable software and processed with multiple effects in VSTHost.
I didn’t put much thought into which effects were used or what settings were used on SDRSharp. Normally the SDR (software defined radio) software works with receivers like Airspy and Funcube, but it can also process audio files and treat them as if they were radio signals.
