If you take exactly the same track (duplicated) and pan the two copies by equal amounts left and right, it will sound like it is coming out the middle.
Bill - sorry for the wording in my posting for I did duplicate the vocal track from the right channel.
Can the same two tracks being left and right channel be panned and get the same position as with mono? I tried but the vocals were still hard left and hard right. It is telling when “Come On” vocal tracks play for these are mono at 35% left and 35% for the right and are perfect for position and sound quality.
The sound quality of the tracks as left-right channel (vs mono) is better but the separation is to great.