Terry,

The MP3 is not a (single) mono-track, there is a left- and right-part. Both parts contain the same audio what results in a MONO-sounding image.
While recording a stereo-signal you have to set the panning of both channels oposite (one full left and the other full-right.

Your voice does NOT have too much reverb at all, there is something very wrong with your phases or settings/wiring.

Could you please record a sample containing only your voice ? (starting center clean, pan to left, pan to right, pan to center, add reverb) Only counting from 1 to 1000 is fine

Roel