It’s common practice in music production that, when you’re layering your vocals with harmonies or doubles, you pan everything but the lead vocal around the stereo field. That gives a sense of physical separation between the voices and it feels more realistic – or artificial, if that’s what you’re going for. With loopers though, you’ll more usually have your overdubs all in the same place, which is fine at the local open mic, where the front of house PA is often mono anyway, but fo...