Changer voice qualities

Hi, I have an audio book that has a really obnoxious narrator. I’d like to make his voice deeper and more resonant. Slowing things down works ok with “Change speed”, but resonation is harder. The closest I can come is with Echo and GVerb, but they just make the voice sound like its being run through an amp, its very electronic and unnatural sounding. I’d like for the voice to sound natural . Any tips?


Trebor to DarrenB-.png