First of all, make sure you convert your mono recording to a stereo wav file even though it will still be a mono sounding playback. Any stereo effects you achieve like pan/expand will have no effect on a mono wav file. Second, the pan/expand effect really only increases the perception of an already stereo recording. What you have to do in order to "re-channel" mono for stereo is either use some sort of delay on one channel, or else add a stereo reverb to the track and pan the reverb to one side a little. Once you have a "fake" stereo recording, then the pan/expand can manipulate it more if needed.

My favorite way to rechannel mono for stereo is to put the original version in the multi-track view in track one and then place a copy of it in the second track. To the copy I apply a reverb with a delay of 100ms depending on the type of recording and a decay of maybe 700ms also depending on the recording. Apply the reverb at 0% dry and 50% wet. Go back to multi-track view and pan the verb track about +20 and the original about -20. Make sure the reverb track is lower in volume than the original by as much as 10db. For an even better effect, leave the original at center and have two copies of the reverb, one panned left and the other right but to different degrees and volumes-you'll have to play with it until it sounds good to you. It's fake, but does the trick to some degree. Feel free to play with my numbers and change them to fit your desired effect. Some recordings demand more decay and delay, whereas others need to remain shorter. Use your ears to guide you. Increasing the amount of pan in the two tracks will increase the stereo effect, but also increase how fake it sounds. Use your best judgement.

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