There’s the MyVolts MickXer (5 channel, passive, iirc), unfortunately the site is down atm.
There’s a trendier, flashier Blender (well, it’s round, like a fat hockey puck) from someone else, but I can’t remember the make. Istr it had a built-in speaker, can be managed from a phone app… Not being much help 
The Field Kit has a built-in mixer plus all the other FK goodness!