Rich Severson does some good demo YouTubes of the Quilter Micropro. This one is from 2012 and uses the same guitar and amp that I own. He has newer demos with newer Quilter models.
I love everything about the original Micropro 8, except for the tremolo which is decent but doesn't match that found in a good Fender tube amp to my ears.
Never tried vocals through my amp.
https://www.youtube.com/watch?v=OOjXBLlFn38