audacity

I'm writing a little application at the moment that will create atmospheric sounds (I'll have it up here as soon as I have a version that actually works!)

Unfortunately, the audio library I'm using (see previous post) only accepts 44100 stereo tracks at the moment (I'm going to look at fixing that at some point!), so I found myself needing to convert some mono tracks into stereo.

I fire up audacity as I normally would, and after about 20 minutes of cursing at the computer because every time I paste, it shifts the other tracks along a bit (still need to find a fix for that!), I find that there's a duplicate function.

Et voila, select the mono track, press Ctrl-D to duplicate, change the two mono tracks to stereo (the little drop-down list on the track > Make Stereo Track), and there you have a nice stereo track :)