No longer maintained: If you want further support you should look at one of the forks.

Takes a mono input and renders it as if it was an interleaved stereo input. Works on MS2109 capture devices where the audio input is a 96khz mono stream but in actuality is a 48khz stereo stream with the first left channel sample missing. In order to support this device better, accounting for this missing first sample is done by default.

Original code based off of Matthew van Eerde's loopback-capture project.

Run mono-to-stereo.exe -? for usage instructions.