Hi guys and gals.

I was chilling in a coffee shop a few days ago when a girl git up to sing some songs. while singing Fleetwood mack songs she would press a pedal that made it sound like there were 5og her all singing in harmony...kind of.

Does anyone know what this effect is?

Cheers muchly,

There are other models and brands with different features. That one works with your guitar to establish the song's key along with I imagine other things.