When ever I send an effects signal to an instrument thats panned hard left or right
the signal goes to both sides of my monitor.

My effect unit only has one output,and the mixing board has 2 inputs(left-right),how do I configure this problem.

When I connect to the left buss input its mono,but if I plug into the right input its only right channel.

I cant figure out how to add a delay to a guitar on the right or left channel without it sending to both side's.

Does anyone understand what im doing wrong?

Do I need to buy a split plug?
One that plugs into the output and plits into 2 jacks as I go into the buss in?

If anyone can help,please do.