coulterphil

Hi all here, i'm new here so plz bear with me.... I'm starting a trio cover group (drums/bass/guitar). I know trying make a trio sound full when lead breaks come can SOMETIMES be hard, so I had a thought, is there a pedal (either individual or a multi fx board) that you can turn down the dry input level and have harmonics and layers coming out to the desk. I've seen some videos where certain reverbs are nearly there and I think I could settle for one but just wondering is there a better idea. I'll be using a splitter box and one output is going direct to my amp and then D.i out to the PA desk,,, the other output from splitter will go to the fx pedal and then take up a separate channel on desk. is there such a gadget and if so will it cost the earth? I do need to keep expense down a little. any help is welcome P