There are many ways to create a wide stereo effect from a monophonic signal. One common method is to run the signal through a pitch shifter. Set the pitch shift to raise the pitch by a few cents — 2-10. If the pitch shifter can do two shifts at once, set the other to lower the pitch by the same number of cents.
Then, pan the dry signal to the center, the raised signal to hard right and the lowered signal to hard left (or vice versa). Adjust the level of the pitch-shifted signals to taste. Making them louder will increase the stereo width, but will begin to add a chorusing effect to the signal. Lower settings for the pitch-shifted signals will add stereo width while maintaining the stability of the dry center signal, with less audible chorusing.