Cousin Ken...
It could be one of several things.
First check mic settings:
Press Mic Setting/Vocal Harmony button.
Is Mic Effect on or off? If on, turn it off and see if that stops the echo you speak of.
Just remember, if you are using registrations the mic setting will save in the registration if the Mic Setting box is checked when you save it to Memory.

In reality, mic settings are very beneficial. Yours may be set to "Delay" and set too high.
I would check mic setting in the mixing control

Press Mixing Control button
Tab to effects
In the Block window, scroll to DSP4
In the Part Window, scroll all the way down to Mic
Now, look at the Category Window...it could be your mic is set to "Delay". Reset it to reverb. Then, select Hall 1 in the Type Window.

Now you should not get any echo.

If all the above proves true, then you should get familiar with all the different mic settings available in the KB and utilize the ones you like.

And, don't forget, by hitting the mic setting /vocal harmonizer button you can turn these effects on and off.

I have assigned mic settings to a footpedal for many of my registrations..and it works like a charm.

I hope this is helpful.

Eddie